Method and apparatus for uplink signal transmission based on codebook in a wireless communication system

ABSTRACT

A method for transmitting an uplink signal based on a codebook by a UE in a wireless communication system includes: receiving, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal; determining the precoding matrix applied to the transmission of the uplink signal from a codebook subset related to the transmission of the uplink signal based on the DCI; and transmitting, to the base station, the uplink signal based on the determined precoding matrix, I which based on that a difference between phase values applied to antenna ports for the transmission of the uplink signal is maintained in some antenna ports among all antenna port pairs, the codebook subset includes at least one specific precoding matrix applying different phase values to antenna ports included in all or some of the some antenna ports.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Provisional Application No.10-2019-0100662 filed on 16 Aug. 2019 in KR the entire contents of whichis hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present disclosure relates to a wireless communication system, andmore particularly, to a method for transmitting an uplink signal basedon a codebook in a wireless communication system, and an apparatustherefor.

Related Art

Mobile communication systems have been developed to guarantee useractivity while providing voice services. Mobile communication systemsare expanding their services from voice only to data. Current soaringdata traffic is depleting resources and users' demand for higher-datarate services is leading to the need for more advanced mobilecommunication systems.

Next-generation mobile communication systems are required to meet, e.g.,handling of explosively increasing data traffic, significant increase inper-user transmission rate, working with a great number of connectingdevices, and support for very low end-to-end latency and high-energyefficiency. To that end, various research efforts are underway forvarious technologies, such as dual connectivity, massive multiple inputmultiple output (MIMO), in-band full duplex, non-orthogonal multipleaccess (NOMA), super wideband support, and device networking.

SUMMARY OF THE INVENTION

The present disclosure provides a method for transmitting an uplinksignal based on a codebook in a wireless communication system, and anapparatus therefor.

The present disclosure also provides a method for transmitting an uplinksignal based on a codebook subset supporting transmission based fullpower transmission, and an apparatus therefor.

The technical objects of the present disclosure are not limited to theaforementioned technical objects, and other technical objects, which arenot mentioned above, will be apparently appreciated by a person havingordinary skill in the art from the following description.

In order to solve the above-described problem, the present disclosureprovides a method for transmitting an uplink signal based on a codebookin a wireless communication system, and an apparatus therefor.

More specifically, in an aspect, provided is a method for transmittingan uplink signal based on a codebook by a UE in a wireless communicationsystem, which includes: receiving, from a base station, downlink controlinformation (DCI) for determining a precoding matrix applied totransmission of the uplink signal; determining the precoding matrixapplied to the transmission of the uplink signal from a codebook subsetrelated to the transmission of the uplink signal based on the DCI; andtransmitting, to the base station, the uplink signal based on thedetermined precoding matrix, I which based on that a difference betweenphase values applied to antenna ports for the transmission of the uplinksignal is maintained in some antenna ports among all antenna port pairs,the codebook subset includes at least one specific precoding matrixapplying different phase values to antenna ports included in all or someof the some antenna ports.

Furthermore, in the present disclosure, the codebook subset may furtherinclude at least one precoding matrix for selecting some antenna portsamong the antenna ports for transmitting the uplink signal.

Furthermore, based on that the determined precoding matrix is oneprecoding matrix among the at least one specific precoding matrix, theuplink signal may be transmitted based on full power transmissionthrough all of the antenna ports for transmitting the uplink signal.

Furthermore, in the present disclosure, the method may further includedetermining uplink transmission power for the uplink transmission basedon the DCI, in which the DCI may further include information on anoptimal power level for the uplink transmission, and the determineduplink transmission power may be divided into a same value and appliedacross all of the antenna ports for the transmission of the uplinksignal.

Furthermore, in the present disclosure, the codebook may include a firstcodebook for rank 1 using four antenna ports for transmitting the uplinksignal, the codebook subset may be configured based on precodingmatrices included in the first codebook, and each of the precodingmatrices included in the first codebook may be indexed by a transmitprecoding matrix indicator (TPMI) index.

Furthermore, in the present disclosure, the first codebook may bedetermined by one of the following tables, and

TABLE W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\\begin{matrix}0 \\j\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\\begin{matrix}j \\j\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- 1} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}1 \\{- j} \\{- j}\end{matrix}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- 1} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}j \\{- j} \\{- 1}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\j \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- j} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\1 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\j \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- 1} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- j} \\1\end{bmatrix}$ — — — —

TABLE W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}1 \\{- 1} \\{- 1}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- j} \\{- j}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}j \\\begin{matrix}{- 1} \\{- j}\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}j \\\begin{matrix}{- j} \\1\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- 1} \\\begin{matrix}1 \\{- 1}\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- 1} \\\begin{matrix}j \\{- j}\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- 1} \\\begin{matrix}{- 1} \\1\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- 1} \\\begin{matrix}{- j} \\j\end{matrix}\end{matrix}\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\1 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- j} \\\begin{matrix}j \\1\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- j} \\\begin{matrix}{- 1} \\j\end{matrix}\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}{- j} \\\begin{matrix}{- j} \\{- 1}\end{matrix}\end{matrix}\end{bmatrix}$ — — — —

here, the TPMI index may be indexed according to ascending order from aleft side to a right side of the table with respect to the precodingmatrices included in the first codebook.

Furthermore, in the present disclosure, the at least one specificprecoding matrix may be a precoding matrix in which the TPMI index is 12to 15 among the precoding matrices included in the first codebook.

Furthermore, in the present disclosure, the at least one specificprecoding matrix is a precoding matrix in which the TPMI index may be12, 17, 22, and 27 among the precoding matrices included in the firstcodebook.

Furthermore, in the present disclosure, the method may further includereceiving, from the base station, configuration information for amaximum rank value for the transmission of the uplink signal.

Furthermore, in the present disclosure, a configuration of the precodingmatrices included in the codebook subset may vary based on the maximumrank value.

Furthermore, in the present disclosure, based on that the maximum rankvalue is 4, the codebook subset may include precoding matrices in whichthe TPMI index is 4 to 15 among the precoding matrices included in thefirst codebook.

Furthermore, in the present disclosure, based on that the maximum rankvalue is 1, the codebook subset may include precoding matrices in whichthe TPMI index is 1 to 15 among the precoding matrices included in thefirst codebook.

Furthermore, in the present disclosure, the codebook may further include(i) a second codebook for rank 2 using four antenna ports fortransmitting the uplink signal, (ii) a third codebook for rank 3 usingfour antenna ports for transmitting the uplink signal, and (iii) afourth codebook for rank 4 using four antenna ports for transmitting theuplink signal, and the codebook subset may be configured further basedon the precoding matrices respectively included in the second to fourthcodebooks.

Furthermore, in the present disclosure, the third codebook may bedetermined by the following table,

TABLE W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\0 & 0 & 1 \\0 & 0 & 0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\1 & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\{- 1} & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\1 & 1 & {- 1} \\1 & {- 1} & {- 1}\end{bmatrix}$ 4-6 $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\j & j & {- j} \\j & {- j} & {- j}\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\1 & 1 & {- 1} \\{- 1} & 1 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\j & j & {- j} \\{- j} & j & j\end{bmatrix}$ —

the fourth codebook may be determined by the following table, and

TABLE W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 & 0 \\0 & 1 & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\1 & {- 1} & 0 & 0 \\0 & 0 & 1 & {- 1}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\j & {- j} & 0 & 0 \\0 & 0 & j & {- j}\end{bmatrix}$ $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\1 & 1 & {- 1} & {- 1} \\1 & {- 1} & {- 1} & 1\end{bmatrix}$ 4 $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\j & j & {- j} & {- j} \\j & {- j} & {- j} & j\end{bmatrix}$ — — —

here, the TPMI index may be indexed according to ascending order from aleft side to a right side of the table with respect to the precodingmatrices respectively included in the third codebook and the fourthcodebook.

Furthermore, in the present disclosure, the codebook subset may furtherinclude (i) a precoding matrix in which the TPMI index is 1 among theprecoding matrices included in the third codebook and (ii) a precodingmatrix in which the TPMI index is 0 among the precoding matricesincluded in the fourth codebook.

Furthermore, in another aspect, provided is a UE transmitting an uplinksignal based on a codebook in a wireless communication system, whichincludes: a transmitter for transmitting a radio signal; a receiver forreceiving the radio signal; and a processor functionally connected tothe transmitter and the receiver, in which the processor controls thereceiver to receive, from a base station, downlink control information(DCI) for determining a precoding matrix applied to transmission of theuplink signal, controls to determine the precoding matrix applied to thetransmission of the uplink signal from a codebook subset related to thetransmission of the uplink signal based on the DCI, and controls thetransmitter to transmit, to the base station, the uplink signal based onthe determined precoding matrix, and based on that a difference betweenphase values applied to antenna ports for the transmission of the uplinksignal is maintained in some antenna ports among all antenna port pairs,the codebook subset includes at least one specific precoding matrixapplying different phase values to antenna ports included in all or someof the some antenna ports.

Furthermore, in yet another aspect, provided is a method for receivingan uplink signal based on a codebook by a base station in a wirelesscommunication system, which includes: transmitting, to a UE, downlinkcontrol information (DCI) for determining a precoding matrix applied totransmission of the uplink signal; and receiving, from the UE, theuplink signal based on the precoding matrix determined based on the DCI,in which based on that a difference between phase values applied toantenna ports for the transmission of the uplink signal is maintained insome antenna ports among all antenna port pairs in the UE, the codebooksubset includes at least one specific precoding matrix applyingdifferent phase values to antenna ports included in all or some of thesome antenna ports.

Furthermore, in still yet another aspect, provided is a base stationreceiving an uplink signal based on a codebook in a wirelesscommunication system, which includes: a transmitter for transmitting aradio signal; a receiver for receiving the radio signal; and a processorfunctionally connected to the transmitter and the receiver, in which theprocessor controls the transmitter to transmit, from the UE, downlinkcontrol information (DCI) for determining a precoding matrix applied totransmission of the uplink signal, and controls the receiver to receive,from the UE, the uplink signal based on the precoding matrix determinedbased on the DCI, and based on that a difference between phase valuesapplied to antenna ports for the transmission of the uplink signal ismaintained in some antenna ports among all antenna port pairs in the UE,the codebook subset includes at least one specific precoding matrixapplying different phase values to antenna ports included in all or someof the some antenna ports.

Furthermore, in still yet another aspect, provided is an apparatus whichincludes: one or more memories; and one or more processors functionallyconnected to the one or more memories, in which the one or moreprocessors control the apparatus to receive, from a base station,downlink control information (DCI) for determining a precoding matrixapplied to transmission of the uplink signal, control the apparatus todetermine the precoding matrix applied to the transmission of the uplinksignal from a codebook subset related to the transmission of the uplinksignal based on the DCI, and control the apparatus to transmit, to thebase station, the uplink signal based on the determined precodingmatrix, and based on that a difference between phase values applied toantenna ports for the transmission of the uplink signal is maintained insome antenna ports among all antenna port pairs, the codebook subsetincludes at least one specific precoding matrix applying different phasevalues to antenna ports included in all or some of the some antennaports.

Furthermore, in still yet another aspect, provided is a non-transitorycomputer readable medium (CRM) storing one or more instructions, inwhich one or more instructions executable by one or more processorscontrol a UE to receive, from a base station, downlink controlinformation (DCI) for determining a precoding matrix applied totransmission of the uplink signal, determine the precoding matrixapplied to the transmission of the uplink signal from a codebook subsetrelated to the transmission of the uplink signal based on the DCI, andtransmit, to the base station, the uplink signal based on the determinedprecoding matrix, and based on that a difference between phase valuesapplied to antenna ports for the transmission of the uplink signal ismaintained in some antenna ports among all antenna port pairs, thecodebook subset includes at least one specific precoding matrix applyingdifferent phase values to antenna ports included in all or some of thesome antenna ports.

In the present disclosure, there is an effect that the uplink signal canbe transmitted based on the codebook in the wireless communicationsystem.

Furthermore, in the present disclosure, there is an effect that theuplink signal can be transmitted based on the codebook subset supportingthe transmission based on the full power transmission.

Furthermore, in the present disclosure, there is an effect that thenon-coherent UE can transmit the uplink signal based on the codebooksubset supporting the transmission based on the full power transmission.

Furthermore, in the present disclosure, there is an effect that thepartial-coherent UE can transmit the uplink signal based on the codebooksubset supporting the transmission based on the full power transmission.

Advantages which can be obtained in the present disclosure are notlimited to the aforementioned advantages and other unmentionedadvantages will be clearly understood by those skilled in the art fromthe following description.

The method for transmitting the uplink data with high reliability n thewireless communication system of the present disclosure is describedbased on an example in which the method is applied to the 3GPP NRsystem, but may be applied to various wireless communication systems inaddition to the 3GPP NR system.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included as part of the detaileddescription in order to provide a thorough understanding of the presentdisclosure, provide embodiments of the present disclosure and togetherwith the description, describe the technical features of the presentdisclosure.

FIG. 1 is a diagram illustrating an example of an overall systemstructure of NR to which a method proposed in the present disclosure maybe applied.

FIG. 2 illustrates a relationship between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed inthe present disclosure may be applied.

FIG. 3 illustrates an example of a frame structure in an NR system.

FIG. 4 illustrates an example of a resource grid supported by a wirelesscommunication system to which a method proposed in the presentdisclosure may be applied.

FIG. 5 illustrates examples of a resource grid for each antenna port andnumerology to which a method proposed in the present disclosure may beapplied.

FIG. 6 illustrates an SSB structure.

FIG. 7 illustrates SSB transmission.

FIG. 8 illustrates that a UE acquires information on DL timesynchronization.

FIG. 9 illustrates physical channels and general signal transmissionused in a 3GPP system.

FIG. 10 is a diagram illustrating an example of a beam used for beammanagement.

FIG. 11 is a flowchart showing an example of a downlink beam managementprocedure.

FIG. 12 illustrates an example of a downlink beam management procedureusing a channel status information reference signal.

FIG. 13 is a flowchart showing an example of a receive beamdetermination process of a UE.

FIG. 14 is a flowchart showing an example of a transmit beamdetermination process of a BS.

FIG. 15 illustrates an example of resource allocation in time andfrequency domains related to a DL BM procedure using a CSI-RS.

FIG. 16 illustrates an example of an uplink beam management procedureusing a Sounding Reference Signal (SRS).

FIG. 17 is a flowchart showing an example of an uplink beam managementprocedure using the SRS.

FIG. 18 is a flowchart showing an example of a CSI related procedure towhich a method proposed in the present disclosure may be applied.

FIG. 19 is a diagram illustrating an example of a downlinktransmission/reception operation between a BS and a UE.

FIG. 20 is a diagram illustrating an example of an uplinktransmission/reception operation between a BS and a UE.

FIG. 21 is a diagram illustrating an example for a configuration schemeof a Tx chain of a UE.

FIG. 22 is a flowchart showing an example an operation implemented in aUE for performing a method in which the UE transmits an uplink signalbased on a codebook in a wireless communication system proposed in thepresent disclosure.

FIG. 23 is a flowchart showing an example an operation implemented in aBS for performing a method in which a UE transmits an uplink signalbased on a codebook in a wireless communication system proposed in thepresent disclosure.

FIG. 24 is a diagram illustrating an example of an uplink transmissionsignaling procedure to which methods proposed in the present disclosuremay be applied.

FIG. 25 illustrates a communication system applied to the presentdisclosure.

FIG. 26 illustrates a wireless device which may be applied to thepresent disclosure.

FIG. 27 illustrates a signal processing circuit for a transmit signal.

FIG. 28 illustrates another example of a wireless device applied to thepresent disclosure.

FIG. 29 illustrates a hand-held device applied to the presentdisclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, preferred embodiments of the present disclosure will bedescribed in detail with reference to the accompanying drawings. Thedetailed description, which will be given below with reference to theaccompanying drawings, is intended to explain exemplary embodiments ofthe present disclosure and is not intended to represent the onlyembodiments in which the present disclosure may be practiced. Thefollowing detailed description includes specific details in order toprovide a thorough understanding of the present disclosure. However,those skilled in the art appreciate that the present disclosure may bepracticed without these specific details.

In some instances, well-known structures and devices may be omitted orshown in a block diagram form centering on the core functions of thestructures and devices in order to avoid obscuring the concepts of thepresent disclosure.

Hereinafter, downlink (DL) means communication from a base station to aterminal and uplink (UL) means communication from the terminal to thebase station. In the downlink, a transmitter may be part of the basestation, and a receiver may be part of the terminal. In the uplink, thetransmitter may be part of the terminal and the receiver may be part ofthe base station. The base station may be expressed as a firstcommunication device and the terminal may be expressed as a secondcommunication device. A base station (BS) may be replaced with termsincluding a fixed station, a Node B, an evolved-NodeB (eNB), a NextGeneration NodeB (gNB), a base transceiver system (BTS), an access point(AP), a network (5G network), an AI system, a road side unit (RSU), avehicle, a robot, an Unmanned Aerial Vehicle (UAV), an Augmented Reality(AR) device, a Virtual Reality (VR) device, and the like. Further, theterminal may be fixed or mobile and may be replaced with terms includinga User Equipment (UE), a Mobile Station (MS), a user terminal (UT), aMobile Subscriber Station (MSS), a Subscriber Station (SS), an AdvancedMobile Station (AMS), a Wireless Terminal (WT), a Machine-TypeCommunication (MTC) device, a Machine-to-Machine (M2M) device, and aDevice-to-Device (D2D) device, the vehicle, the robot, an AI module, theUnmanned Aerial Vehicle (UAV), the Augmented Reality (AR) device, theVirtual Reality (VR) device, and the like.

The following technology may be used in various wireless access systemsincluding CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. The CDMA maybe implemented as radio technology such as Universal Terrestrial RadioAccess (UTRA) or CDMA2000. The TDMA may be implemented as radiotechnology such as global system for mobile communications (GSM)/generalpacket radio service (GPRS)/enhanced data rates for GSM evolution(EDGE). The OFDMA may be implemented as radio technology such asInstitute of IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20,Evolved UTRA (E-UTRA), or the like. The UTRA is part of Universal MobileTelecommunications System (UMTS). 3rd Generation Partnership Project(3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS)using the E-UTRA and LTE-Advanced (A)/LTE-A pro is an evolved version ofthe 3GPP LTE. 3GPP New Radio (NR) or New Radio Access Technology is anevolved version of the 3GPP LTE/LTE-A/LTE-A pro.

For clarity of description, the present disclosure is described based onthe 3GPP communication system (e.g., LTE-A or NR), but the technicalspirit of the present disclosure are not limited thereto. LTE meanstechnology after 3GPP TS 36.xxx Release 8. In detail, LTE technologyafter 3GPP TS 36.xxx Release 10 is referred to as the LTE-A and LTEtechnology after 3GPP TS 36.xxx Release 13 is referred to as the LTE-Apro. The 3GPP NR means technology after TS 38.xxx Release 15. The LTE/NRmay be referred to as a 3GPP system. “xxx” means a standard documentdetail number. The LTE/NR may be collectively referred to as the 3GPPsystem. Matters disclosed in a standard document published before thepresent disclosure may refer to a background art, terms, abbreviations,etc., used for describing the present disclosure. For example, thefollowing documents may be referred to.

3GPP LTE

-   -   36.211: Physical channels and modulation    -   36.212: Multiplexing and channel coding    -   36.213: Physical layer procedures    -   36.300: Overall description    -   36.331: Radio Resource Control (RRC)

3GPP NR

-   -   38.211: Physical channels and modulation    -   38.212: Multiplexing and channel coding    -   38.213: Physical layer procedures for control    -   38.214: Physical layer procedures for data    -   38.300: NR and NGRAN Overall Description    -   36.331: Radio Resource Control (RRC) protocol specification

Definition and Abbreviations

BM: beam management

CQI: channel quality indicator

CRI: CSI-RS (channel state information-reference signal) resourceindicator

CSI: channel state information

CSI-IM: channel state information-interference measurement

CSI-RS: channel state information-reference signal

DMRS: demodulation reference signal

FDM: frequency division multiplexing

FFT: fast Fourier transform

IFDMA: interleaved frequency division multiple access

IFFT: inverse fast Fourier transform

L1-RSRP: Layer 1 reference signal received power

L1-RSRQ: Layer 1 reference signal received quality

MAC: medium access control

NZP: non-zero power

OFDM: orthogonal frequency division multiplexing

PDCCH: physical downlink control channel

PDSCH: physical downlink shared channel

PMI: precoding matrix indicator

RE: resource element

RI: Rank indicator

RRC: radio resource control

RSSI: received signal strength indicator

Rx: Reception

QCL: quasi co-location

SINR: signal to interference and noise ratio

SSB (or SS/PBCH block): synchronization signal block (including primarysynchronization signal, secondary synchronization signal and physicalbroadcast channel)

TDM: time division multiplexing

TRP: transmission and reception point

TRS: tracking reference signal

Tx: transmission

UE: user equipment

ZP: zero power

NR Radio access

As more and more communication devices require larger communicationcapacity, there is a need for improved mobile broadband communicationcompared to the existing radio access technology (RAT). Further, massivemachine type communications (MTCs), which provide various servicesanytime and anywhere by connecting many devices and objects, are one ofthe major issues to be considered in the next generation communication.In addition, a communication system design considering a service/UEsensitive to reliability and latency is being discussed. As such, theintroduction of next-generation radio access technology consideringenhanced mobile broadband communication (eMBB), massive MTC (mMTC),ultra-reliable and low latency communication (URLLC) is discussed, andin the present disclosure, the technology is called NR for convenience.The NR is an expression representing an example of 5G radio accesstechnology (RAT).

In a New RAT system including NR uses an OFDM transmission scheme or asimilar transmission scheme thereto. The new RAT system may follow OFDMparameters different from OFDM parameters of LTE. Alternatively, the newRAT system may follow numerology of conventional LTE/LTE-A as it is orhave a larger system bandwidth (e.g., 100 MHz). Alternatively, one cellmay support a plurality of numerologies. In other words, UEs thatoperate with different numerologies may coexist in one cell.

The numerology corresponds to one subcarrier spacing in a frequencydomain. Different numerology may be defined by scaling referencesubcarrier spacing to an integer N.

Three major requirement areas of 5G include (1) an Enhanced MobileBroadband (eMBB) area, (2) a Massive Machine Type Communication (mMTC)area, and (3) an Ultra-reliable and Low Latency Communications (URLLC)area.

Some use cases may require multiple areas for optimization and other usecases may only focus on only one key performance indicator (KPI). 5G isto support the various use cases in a flexible and reliable method.

eMBB far surpasses basic mobile Internet access and covers media andentertainment applications in rich interactive work, cloud or augmentedreality. Data is one of the key drivers of 5G and may not be able to seededicated voice services for the first time in the 5G era. In 5G, thevoice is expected to be processed as an application program simply byusing data connection provided by a communication system. Main reasonsfor an increased traffic volume are an increase in content size and anincrease in number of applications requiring a high data rate. Astreaming service (audio and video), an interactive video, and mobileInternet connection will be more widely used as more devices areconnected to the Internet. A lot of application programs requirealways-on connectivity in order to push real-time information andnotification to a user. Cloud storages and applications are growingrapidly in mobile communication platforms, which may be applied to bothwork and entertainment. In addition, the cloud storage is a special usecase of drives a growth of an uplink data transmission rate. 5G is alsoused in remote work of the cloud and requires a lower end-to-end latencyso as to maintain an excellent user experience when a tactile interfaceis used. The entertainment, for example, a cloud game and videostreaming are another key factor for increasing a demand for a mobilebroadband capability. The entertainment is required in a smart phone anda tablet anywhere including a high mobility environment such as a train,a vehicle, and an airplane. Another use case is augmented reality andinformation retrieval for the entertainment. Here, the augmented realityrequires a very low latency and an instantaneous data amount.

Further, one of 5G use cases most expected relates to a function tosmoothly connect an embedded sensor in all fields, that is, mMTC. By2020, the number of potential IoT devices is expected to reach 20.4billion. Industry IoT is one of the areas where 5G plays a key role inenabling smart cities, asset tracking, smart utilities, agriculture, andsecurity infrastructures.

URLLC includes new services that will change the industry through ultrareliable/usable links with low latency such as remote control of keyinfrastructure and self-driving vehicles. Levels of reliability andlatency are required for smart grid control, industrial automation,robotics, and drone control and adjustment.

Next, multiple use cases will be described in more detail.

5G may complement fiber-to-the-home (FTTH) and cable-based broadband (orDOCSIS) as a means of providing streams rated as gigabits per second athundreds of megabits per second. Such a fast speed is required todeliver TVs with resolutions of 4K and above (6K, 8K, and above) as wellas virtual reality and the augmented reality. The Virtual Reality (VR)and Augmented Reality (AR) applications include mostly immersive sportsgames. A specific application program may require a special networkconfiguration. For example, in the case of a VR game, game companies mayneed to integrate a core server with an edge network server of a networkoperator in order to minimize latency.

Automotive is expected to become an important new power for 5G, withmany use cases for mobile communications to vehicles. For example,entertainment for passengers demands simultaneous high capacity and highmobility mobile broadband. The reason is that future users will continueto expect high-quality connections regardless of locations and speedsthereof. Another utilization example of an automotive field is anaugmented-reality dashboard. This identifies an object in the dark overwhat a driver is seeing through a front window, and overlaps anddisplays information that tells the driver regarding a distance and amotion of the object. In the future, a wireless module enablescommunication between vehicles, information exchange between the vehicleand a supported infrastructure, and information exchange between thevehicle and other connected devices (e.g., devices carried by apedestrian). A safety system guides an alternative course of an actionin order for the driver to drive safer driving, thereby reducing therisk of accidents. A next step will be a remotely controlled orself-driven vehicle. This requires very reliable and very fastcommunication between different self-driven vehicles and between theautomatic and the infrastructure. In the future, the self-driven vehiclewill perform all driving activities and the driver will focus only ontraffic which the vehicle itself may not identify. Technicalrequirements of the self-driven vehicle require ultra-low latency andultra-high-speed reliability so as to increase a traffic safety to alevel not achievable by humans.

Smart cities and smart homes, referred to as smart societies, will beembedded into high-density wireless sensor networks. A distributednetwork of intelligent sensors will identify conditions for cost andenergy-efficient maintenance of a city or house. A similar configurationmay be performed for each home. Temperature sensors, windows and heatingcontrollers, burglar alarms, and home appliances are all wirelesslyconnected. Many of the sensors typically have low data rate, low power,and low cost. However, for example, real-time HD video may be requiredfor specific types of devices for monitoring.

As consumption and distribution of energy including heat or gas ishighly dispersed, automated control of distributed sensor networks isrequired. A smart grid interconnects the sensors using digitalinformation and communication technologies to collect information andact based on the information. The information may include vendor andconsumer behaviors, allowing the smart grid to improve the distributionof fuels, such as electricity, in an efficiency, reliability, economics,and sustainability of production and in an automated way. The smart gridmay be regarded as another sensor network with low latency.

A health sector has many application programs that may benefit frommobile communications. Communication systems may support telemedicine toprovide clinical care in remote locations. This may help to reducebarriers to a distance and improve an access to health services that arenot continuously available in distant rural areas. This is also used tosave lives in critical care and emergency situations. Wirelesscommunication based wireless sensor networks may provide remotemonitoring and sensors for parameters such as heart rate and bloodpressure.

Wireless and mobile communications are becoming increasingly importantin industrial application fields. Wires are high in installation andmaintenance cost. Thus, a possibility of replacing cables withreconfigurable wireless links is an attractive opportunity in manyindustries. However, achieving this requires that wireless connectionsoperate with similar delay, reliability, and capacity as cables, andthat their management is simplified. Low latency and very low errorprobabilities are new requirements that need to be connected to 5G.

Logistics and freight tracking are important use cases of mobilecommunications that enable tracking of inventory and packages anywhereusing location based information systems. Use cases of logistics andfreight tracking typically require low data rates, but require a largerange and reliable location information.

Overview of System

FIG. 1 is a view illustrating an example overall NR system structure towhich a method as proposed in the disclosure may apply.

Referring to FIG. 1, an NG-RAN is constituted of gNBs to provide acontrol plane (RRC) protocol end for user equipment (UE) and NG-RA userplane (new AS sublayer/PDCP/RLC/MAC/PHY).

The gNBs are mutually connected via an Xn interface.

The gNBs are connected to the NGC via the NG interface.

More specifically, the gNB connects to the access and mobilitymanagement function (AMF) via the N2 interface and connects to the userplane function (UPF) via the N3 interface.

New RAT (NR) numerology and frame structure

In the NR system, a number of numerologies may be supported. Here, thenumerology may be defined by the subcarrier spacing and cyclic prefix(CP) overhead. At this time, multiple subcarrier spacings may be derivedby scaling the basic subcarrier spacing by integer N (or, μ). Further,although it is assumed that a very low subcarrier spacing is not used ata very high carrier frequency, the numerology used may be selectedindependently from the frequency band.

Further, in the NR system, various frame structures according tomultiple numerologies may be supported.

Hereinafter, an orthogonal frequency division multiplexing (OFDM)numerology and frame structure that may be considered in the NR systemis described.

The multiple OFDM numerologies supported in the NR system may be definedas shown in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15[kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal

The NR supports multiple numerologies (or subcarrier spacing (SCS)) forsupporting various 5G services. For example, when the SCS is 15 kHz, awide area in traditional cellular bands is supported and when the SCS is30 kHz/60 kHz, dense-urban, lower latency, and wider carrier bandwidthare supported, and when the SCS is 60 kHz or higher therethan, abandwidth larger than 24.25 GHz is supported in order to overcome phasenoise.

An NR frequency band is defined as frequency ranges of two types (FR1and FR2). FR1 and FR2 may be configured as shown in Table 2 below.Further, FR2 may mean a millimeter wave (mmW).

TABLE 2 Frequency Range Corresponding frequency designation rangeSubcarrier Spacing FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

In connection with the frame structure in the NR system, the size ofvarious fields in the time domain is expressed as a multiple of timeunit T_(s)=1/(Δf_(max)·N_(f)). Here, Δf_(max)=480·10³, and N_(f)=4096. Adownlink and uplink transmission is constituted of a radio frame with aperiod of T_(f)=(Δf_(max)N_(f)/100)·T_(s)=10 ms. Here, the radio frameis constituted of 10 subframes each of which has a period ofT_(sf)=(Δf_(max)N_(f)/1000)·T_(s)=1 ms. In this case, one set of framesfor uplink and one set of frames for downlink may exist.

FIG. 2 illustrates the relationship between an uplink frame and downlinkframe in a wireless communication system to which a method as proposedin the disclosure may apply.

As shown in FIG. 2, transmission of uplink frame number i from the userequipment (UE) should begin T_(TA)=N_(TA)T_(s) earlier than the start ofthe downlink frame by the UE.

For numerology μ, slots are numbered in ascending order of n_(s)^(μ)ϵ{0, . . . , N_(subframe) ^(slots,μ)−1} in the subframe and inascending order of n_(s,f) ^(μ)ϵ{0, . . . , N_(frame) ^(slots,μ)−1} inthe radio frame. One slot includes consecutive OFDM symbols of N_(symb)^(μ), and N_(symb) ^(μ) is determined according to the used numerologyand slot configuration. In the subframe, the start of slot n_(s) ^(μ) istemporally aligned with the start of N_(s) ^(μ)N_(symb) ^(μ).

All UEs are not simultaneously capable of transmission and reception,and this means that all OFDM symbols of the downlink slot or uplink slotmay not be used.

Table 3 shows the number of OFDM symbols for each slot (N_(symb)^(slot)), the number of slots for each radio frame (N_(slot)^(frame,μ)), and the number of slots for each subframe (N_(slot)^(subframes,μ)) in a normal CP and Table 4 shows the number of OFDMsymbols for each slot, the number of slots for each radio frame, and thenumber of slots for each subframe in an extended CP.

TABLE 3 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

TABLE 4 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)2 12 40 4

FIG. 3 illustrates an example of a frame structure in an NR system. FIG.3 is just for convenience of the description and does not limit thescope of the present disclosure.

In the case of Table 4, as an example of a case where μ=2, i.e., a casewhere a subcarrier spacing (SCS) is 60 kHz, one subframe (or frame) mayinclude four slots by referring to Table 3 and as an example, a case ofone subframe={1,2,4} slots is illustrated in FIG. 3 and the number ofslot(s) which may be included in one subframe may be defined as shown inTable 3.

Further, a mini-slot may be constituted by 2, 4, or 7 symbols andconstituted by more or less symbols.

In connection with the physical resource in the NR system, antenna port,resource grid, resource element, resource block, and carrier part may betaken into consideration.

Hereinafter, the physical resources that may be considered in the NRsystem are described in detail.

First, in connection with antenna port, the antenna port is defined sothat the channel carrying a symbol on the antenna port may be inferredfrom the channel carrying another symbol on the same antenna port. Wherethe large-scale property of the channel carrying a symbol on one antennaport may be inferred from the channel carrying a symbol on a differentantenna port, the two antenna ports may be said to have a QC/QCL (quasico-located or quasi co-location) relationship. Here, the large-scaleproperties include one or more of delay spread, Doppler spread,frequency shift, average received power, and received timing.

FIG. 4 illustrates an example resource grid supported in a wirelesscommunication system to which a method as proposed in the disclosure mayapply.

Referring to FIG. 4, although an example is described in which theresource grid is constituted of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers inthe frequency domain, and one subframe includes 14·2μ OFDM symbols,embodiments of the disclosure are not limited thereto.

In the NR system, the transmitted signal is described with one or moreresource grids constituted of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers and2^(μ)N_(symb) ^((μ)) OFDM symbols. Here, N_(RB) ^(μ)≤N_(RB) ^(max,μ).N_(RB) ^(max,μ) refers to the maximum transmission bandwidth, and thismay be varied between uplink and downlink as well as numerologies.

In this case, as shown in FIG. 4, one resource grid may be configuredper numerology μ and antenna port p.

FIG. 5 illustrates examples of per-antenna port and numerology resourcegrids to which a method as proposed in the disclosure may apply.

Each element of the resource grid for numerology μ and antenna port p isdenoted a resource element and is uniquely identified by index pair(k,l). Here, k=0, . . . , N_(RB) ^(μ)N_(sc) ^(RB)−1 is the index in thefrequency domain, and l=0, . . . , 2^(μ)N_(symb) ^((μ)−)1 denotes theposition of symbol in the subframe. Upon denoting the resource elementin slot, index pair (k,l) is used. Here, l=0, . . . , N_(symb) ^(μ)−1.

For numerology μ and antenna port, resource element (k,l) corresponds tocomplex value a_(k,l) ^((p,μ)). Where there is no risk of confusion orwhere a specific antenna port or numerology is not specified, indexes pand μ may be dropped and, as a result, the complex value may becomea_(k,l(p)) or a_(k,l.)

The physical resource block is defined with N_(sc) ^(RB)=12 consecutivesubcarriers in the frequency domain.

Point A may serve as a common reference point of a resource block gridand may be acquired as follows.

-   -   OffsetToPointA for PCell downlink indicates the frequency offset        between the lowest subcarrier of the lowest resource block        superposed with the SS/PBCH block used by the UE for initial        cell selection and point A, and is expressed by resource block        units assuming a 15 kHz subcarrier spacing for FR1 and a 60 kHz        subcarrier spacing for FR2; and    -   absoluteFrequencyPointA indicates the frequency-position of        point A expressed as in an absolute radio-frequency channel        number (ARFCN).

Common resource blocks are numbered upwards from 0 in the frequencydomain for a subcarrier spacing setting μ.

A center of subcarrier 0 for common resource block 0 for the subcarrierspacing setting μ coincides with ‘point A’. The resource element (k,l)for common resource block number n_(CRB) ^(μ) and the subcarrier spacingsetting μ in the frequency domain is given as in Equation 1 below.

$\begin{matrix}{n_{CRB}^{\mu} = \lfloor \frac{k}{N_{sc}^{RB}} \rfloor} & \lbrack {{Equation}\mspace{14mu} 1} \rbrack\end{matrix}$

Here, k may be relatively defined in point A so that k=0 corresponds toa subcarrier centering on point A. Physical resource blocks are numberedwith 0 to N_(BWP,j) ^(size)−1 in a bandwidth part (BWP) and i representsthe number of the BWP. A relationship between the physical resourceblock n_(PRB) and the common resource block n_(CRB) in BWP i is given byEquation 2 below.

n _(CRB) =n _(PRB) +N _(BWP,i) ^(start)  [Equation 2]

Here, N_(BWP,j) ^(start) may be a common resource block in which the BWPrelatively starts to common resource block 0.

Synchronization Signal Block (SSB) Transmission and Related Operation

FIG. 6 illustrates an SSB structure. The UE may perform cell search,system information acquisition, beam alignment for initial access, DLmeasurement, etc., based on an SSB. The SSB is mixedly used with anSS/Synchronization Signal/Physical Broadcast channel (PBCH) block.

Referring to FIG. 6, the SSB is constituted by PSS, SSS, and PBCH. TheSSB is constituted by four continuous OFDM symbols and the PSS, thePBCH, the SSS/PBCH, and the PBCH are transmitted for each OFDM symbol.Each of the PSS and the SSS may be constituted by one OFDM symbol and127 subcarriers and the PBCH is constituted by 3 OFDM symbols and 576subcarriers. Polar coding and quadrature phase shift keying (QPSK) areapplied to the PBCH. The PBCH is constituted by a data RE and ademodulation reference signal (DMRS) RE for each OFDM symbol. Three DMRSREs exist for each RB, and three data REs exist between DMRS REs.

Cell Search

The cell search refers to a process of acquiring time/frequencysynchronization of the cell and detecting a cell identifier (ID) (e.g.,physical layer cell ID (PCID)) of the cell by the UE. The PSS is used todetect the cell ID within a cell ID group and the SSS is used to detectthe cell ID group. The PBCH is used for SSB (time) index detection andhalf-frame detection.

A cell search process of the UE may be organized as shown in Table 5below.

TABLE 5 Type of Signals Operations 1st PSS SS/PBCH block (SSB) symboltiming step acquisition Cell ID detection within a cell ID group (3hypothesis) 2nd SSS Cell ID group detection (336 hypothesis) Step 3rdPBCH SSB index and Half frame (HF) index Step DMRS (Slot and frameboundary detection) 4th PBCH Time information (80 ms, System Step FrameNumber (SFN), SSB index, HF) Remaining Minimum System Information (RMSI)Control resource set (CORESET)/ Search space configuration 5th PDCCH andCell access information Step PDSCH RACH configuration

There are 336 cell ID groups, and three cell IDs exist for each cell IDgroup. There may be a total of 1008 cell IDs and the cell ID may bedefined by Equation 3.

N _(ID) ^(cell)=3N _(ID) ⁽¹⁾ +N _(ID) ⁽²⁾  [Equation 3]

Here, N_(ID) ⁽¹⁾ϵ{0,1, . . . ,335} and N_(ID) ⁽²⁾ϵ{0,1,2}.

Here, NcellID represents a cell ID (e.g., PCID). N(1)ID represents acell ID group and is provided/acquired through the SSS. N(2)IDrepresents a cell ID in the cell ID group and is provided/acquiredthrough the PSS.

PSS sequence dPSS(n) may be defined to satisfy Equation 4.

d _(PSS)(n)=1−2x(m)  [Equation 4]

-   -   m=(n+43N_(ID) ⁽²⁾)mod 127    -   0≤n<127

Here, x(i+7)=(x(i+4)+x(i))mod 2, and

[x(6) x(5) x(4) x(3) x(2) x(1) x(0)1=1 1 0 1 1 0]

SSS sequence dSSS(n) may be defined to satisfy Equation 5.

$\begin{matrix}{{d_{SSS}(n)} = {\lbrack {1 - {2{x_{0}( {( {n + m_{0}} )\mspace{11mu} {mod}\ 127} )}}} \rbrack {\quad{{{\lbrack {1 - {2{x_{1}( {( {n + m_{1}} ){mod}\ 127} )}}} \rbrack \mspace{79mu} m_{0}} = {{{15\lfloor \frac{N_{ID}^{(1)}}{112} \rfloor} + {5N_{ID}^{(2)}\mspace{79mu} m_{1}}} = {{{N_{ID}^{(1)}\mspace{11mu} {mod}\mspace{11mu} 112\mspace{20mu} 0} \leq n < {127\mspace{20mu} {x_{0}( {i + 7} )}}} = {( {{x_{0}( {i + 4} )} + {x_{0}(i)}} )\mspace{11mu} {mod}\ 2\mspace{20mu} {Here}}}}},\mspace{20mu} {{x_{1}( {i + 7} )} = {( {{x_{1}( {i + 1} )} + {x_{1}(i)}} )\mspace{11mu} {mod}\ 2}},{{{and}\begin{bmatrix}{x_{0}(6)} & {x_{0}(5)} & {x_{0}(4)} & {x_{0}(3)} & {{x_{0}(2)}\ } & {x_{0}(1)} & {x_{0}(0)}\end{bmatrix}} = {\quad{{\begin{bmatrix}0 & 0 & 0 & 0 & 0 & 0 & 1\end{bmatrix}\begin{bmatrix}{x_{1}(6)} & {x_{1}(5)} & {x_{1}(4)} & {x_{1}(3)} & {{x_{1}(2)}\ } & {x_{1}(1)} & {x_{1}(0)}\end{bmatrix}} = {\quad{\lbrack \begin{matrix}0 & 0 & 0 & 0 & 0 & 0 & 1\end{matrix} \rbrack.}}}}}}}}} & \lbrack {{Equation}\mspace{14mu} 5} \rbrack\end{matrix}$

FIG. 7 illustrates SSB transmission.

The SSB is periodically transmitted according to SSB periodicity. An SSBbasic periodicity assumed by the UE in initial cell search is defined as20 ms. After cell access, the SSB periodicity may be configured by oneof {5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 16 0 ms} by the network (e.g.,BS). At a beginning part of the SSB periodicity, a set of SSB bursts isconfigured. The SSB burst set may be configured by a 5-ms time window(i.e., half-frame) and the SSB may be transmitted up to L times withinthe SS burst set. L which is the maximum number of transmissions of theSSB may be given as follows according to a frequency band of a carrier.One slot includes up to two SSBs.

-   -   For frequency range up to 3 GHz, L=4    -   For frequency range from 3 GHz to 6 GHz, L=8    -   For frequency range from 6 GHz to 52.6 GHz, L=64

A time position of an SSB candidate in the SS burst set may be definedas follows according to SCS. The time positions of the SSB candidatesare indexed from 0 to L−1 in chronological order within the SSB burstset (i.e., half-frame) (SSB index).

-   -   Case A—15 kHz SCS: The index of the start symbol of the        candidate SSB is given as {2, 8}+14*n. When the carrier        frequency is 3 GHz or less, n=0, 1. When the carrier frequency        is 3 to 6 GHz, n=0, 1, 2, 3.    -   Case B—30 kHz SCS: The index of the start symbol of the        candidate SSB is given as {4, 8, 16, 20}+28*n. When the carrier        frequency is 3 GHz or less, n=0. When the carrier frequency is 3        to 6 GHz, n=0, 1.    -   Case C—30 kHz SCS: The index of the start symbol of the        candidate SSB is given as {2, 8}+14*n. When the carrier        frequency is 3 GHz or less, n=0, 1. When the carrier frequency        is 3 to 6 GHz, n=0, 1, 2, 3.    -   Case D—120 kHz SCS: The index of the start symbol of the        candidate SSB is given as {4, 8, 16, 20}+28*n. When the carrier        frequency is more than 6 GHz, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11,        12, 13, 15, 16, 17, 18.    -   Case E—240 kHz SCS: The index of the start symbol of the        candidate SSB is given as {8, 12, 16, 20, 32, 36, 40, 44}+56*n.        When the carrier frequency is more than 6 GHz, n=0, 1, 2, 3, 5,        6, 7, 8.

FIG. 8 illustrates that a UE acquires information on DL timesynchronization.

The UE may acquire DL synchronization by detecting the SSB. The UE mayidentify the structure of the SSB burst set based on the detected SSBindex, and thus detect a symbol/slot/half-frame boundary. The number ofthe frame/half-frame to which the detected SSB belongs may be identifiedusing SFN information and half-frame indication information.

Specifically, the UE may acquire 10-bit System Frame Number (SFN)information from the PBCH (s0 to s9). 6 bits of the 10-bit SFNinformation are obtained from a Master Information Block (MIB), and theremaining 4 bits are obtained from a PBCH Transport Block (TB).

Next, the UE may acquire 1-bit half-frame indication information (c0).When a carrier frequency is 3 GHz or less, the half-frame indicationinformation may be implicitly signaled using PBCH DMRS. The PBCH DMRSindicates 3-bit information by using one of eight PBCH DMRS sequences.Accordingly, in the case of L=4, 1 bit which remains after indicatingthe SSB index among 3 bits which may be indicated by using eight PBCHDMRS sequences may be used for half frame indication.

Last, the UE may acquire the SSB index based on a DMRS sequence and aPBCH payload. SSB candidates are indexed from 0 to L−1 in chronologicalorder within the SSB burst set (i.e., half-frame). In the case of L=8 or64, Least Significant Bit (LSB) 3 bits of the SSB index may be indicatedusing eight different PBCH DMRS sequences (b0 to b2). In the case ofL=64, Most Significant Bit (MSB) 3 bits of the SSB index are indicatedthrough the PBCH (b3 to b5). In the case of L=2, LSB 2 bits of the SSBindex may be indicated using four different PBCH DMRS sequences (b0 andb1). In the case of L=4, 1 bit which remains after indicating the SSBindex among 3 bits which may be indicated by using eight PBCH DMRSsequences may be used for the half frame indication (b2).

Physical Channel and General Signal Transmission

FIG. 9 illustrates physical channels and general signal transmissionused in a 3GPP system. In the wireless communication system, the UEreceives information from the BS through Downlink (DL) and the UEtransmits information from the BS through Uplink (UL). The informationwhich the BS and the UE transmit and receive includes data and variouscontrol information and there are various physical channels according toa type/use of the information which the BS and the UE transmit andreceive.

When the UE is powered on or newly enters a cell, the UE performs aninitial cell search operation such as synchronizing with the BS (S601).To this end, the UE may receive a Primary Synchronization Signal (PSS)and a (Secondary Synchronization Signal (SSS) from the BS andsynchronize with the eNB and acquire information such as a cell ID orthe like. Thereafter, the UE may receive a Physical Broadcast Channel(PBCH) from the BS and acquire in-cell broadcast information. Meanwhile,the UE receives a Downlink Reference Signal (DL RS) in an initial cellsearch step to check a downlink channel status.

A UE that completes the initial cell search receives a Physical DownlinkControl Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH)according to information loaded on the PDCCH to acquire more specificsystem information (S602).

Meanwhile, when there is no radio resource first accessing the BS or forsignal transmission, the UE may perform a Random Access Procedure (RACH)to the BS (S603 to S606). To this end, the UE may transmit a specificsequence to a preamble through a Physical Random Access Channel (PRACH)(S603 and S605) and receive a response message (Random Access Response(RAR) message) for the preamble through the PDCCH and a correspondingPDSCH. In the case of a contention based RACH, a Contention ResolutionProcedure may be additionally performed (S606).

The UE that performs the above-described procedure may then performPDCCH/PDSCH reception (S607) and Physical Uplink Shared Channel(PUSCH)/Physical Uplink Control Channel (PUCCH) transmission (S608) as ageneral uplink/downlink signal transmission procedure. In particular,the UE may receive Downlink Control Information (DCI) through the PDCCH.Here, the DCI may include control information such as resourceallocation information for the UE and formats may be differently appliedaccording to a use purpose.

Meanwhile, the control information which the UE transmits to the BSthrough the uplink or the UE receives from the eNB may include adownlink/uplink ACK/NACK signal, a Channel Quality Indicator (CQI), aPrecoding Matrix Index (PMI), a Rank Indicator (RI), and the like. TheUE may transmit the control information such as the CQI/PMI/RI, etc.,through the PUSCH and/or PUCCH.

Table 6 shows an example of a DCI format in the NR system.

TABLE 6 DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1Scheduling of PDSCH in one cell

Referring to Table 6, DCI format 0_0 is used for scheduling of the PUSCHin one cell.

Information included in DCI format 0_0 is CRC-scrambled and transmittedby C-RNTI, CS-RNTI, or MCS-C-RNTI. In addition, DCI format 0_1 is usedfor reserving the PUSCH in one cell. Information included in DCI format0_1 is CRC-scrambled and transmitted by C-RNTI, CS-RNTI, SP-CSI-RNTI, orMCS-C-RNTI. DCI format 1_0 is used for scheduling of the PDSCH in one DLcell. Information included in DCI format 1_0 is CRC-scrambled andtransmitted by C-RNTI, CS-RNTI, or MCS-C-RNTI. DCI format 1_1 is usedfor scheduling of the PDSCH in one cell. Information included in DCIformat 1_1 is CRC-scrambled and transmitted by C-RNTI, CS-RNTI, orMCS-C-RNTI. DCI format 2_1 is used to inform PRB(s) and OFDM symbol(s)of which the UE may assume not intending transmission.

The following information included in DCI format 2_1 is CRC-scrambledand transmitted by INT-RNTI.

-   -   preemption indication 1, preemption indication 2, . . . ,        preemption indication N.

In the present disclosure, proposed are a signaling scheme and a UE/BSbehavior for indicating/supporting a padding technique applied when adimension size of information related to a spatial domain/frequencydomain/time domain used for an implementation reason is smaller than asize of a DFT vector when configuring the codebook using the DFT vectorin relation to CSI acquisition/reporting.

In the present disclosure, ‘/’ may mean that all of the contentsdistinguished by/(and) or include only some of the distinguishedcontents (or).

Hereinafter, downlink (DL) means communication from a base station to aterminal and uplink (UL) means communication from the terminal to thebase station. In the downlink, a transmitter may be part of the basestation, and a receiver may be part of the terminal. In the uplink, thetransmitter may be part of the terminal and the receiver may be part ofthe base station. The base station may be expressed as a firstcommunication device and the terminal may be expressed as a secondcommunication device. A base station (BS) may be replaced with termsincluding a fixed station, a Node B, an evolved-NodeB (eNB), a NextGeneration NodeB (gNB), a base transceiver system (BTS), an access point(AP), a network (5G network), an artificial intelligence (AI)system/module, a road side unit (RSU), a robot, an Unmanned AerialVehicle (UAV), an Augmented Reality (AR) device, a Virtual Reality (VR)device, and the like. Further, the terminal may be fixed or mobile andmay be replaced with terms including a User Equipment (UE), a MobileStation (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), aSubscriber Station (SS), an Advanced Mobile Station (AMS), a WirelessTerminal (WT), a Machine-Type Communication (MTC) device, aMachine-to-Machine (M2M) device, and a Device-to-Device (D2D) device,the vehicle, the road side unit (RSU), the robot, the artificialintelligence (AI) module, the Unmanned Aerial Vehicle (UAV), theAugmented Reality (AR) device, the Virtual Reality (VR) device, and thelike.

Beam Management (BM)

A BM procedure as layer 1 (L1)/layer 2 (L2) procedures for acquiring andmaintaining a set of base station (e.g., gNB, TRP, etc.) and/or terminal(e.g., UE) beams which may be used for downlink (DL) and uplink (UL)transmission/reception may include the following procedures and terms.

-   -   Beam measurement: Operation of measuring characteristics of a        received beamforming signal by the BS or UE.    -   Beam determination: Operation of selecting a transmit (Tx)        beam/receive (Rx) beam of the BS or UE by the BS or UE.    -   Beam sweeping: Operation of covering a spatial region using the        transmit and/or receive beam for a time interval by a        predetermined scheme.    -   Beam report: Operation in which the UE reports information of a        beamformed signal based on beam measurement.

The BM procedure may be divided into (1) a DL BM procedure using asynchronization signal (SS)/physical broadcast channel (PBCH) Block orCSI-RS and (2) a UL BM procedure using a sounding reference signal(SRS).

Further, each BM procedure may include Tx beam sweeping for determiningthe Tx beam and Rx beam sweeping for determining the Rx beam.

Downlink Beam Management (DL BM)

FIG. 10 is a diagram illustrating an example of a beam used for beammanagement.

The DL BM procedure may include (1) transmission of beamformed DLreference signals (RSs) (e.g., CIS-RS or SS Block (SSB)) of the eNB and(2) beam reporting of the UE.

Here, the beam reporting a preferred DL RS identifier (ID)(s) andL1-Reference Signal Received Power (RSRP).

The DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RSResource Indicator (CRI).

As illustrated in FIG. 10, an SSB beam and a CSI-RS beam may be used forthe beam management. A measurement metric is an L1-RSRP for eachresource/block. The SSB may be sued for coarse beam management and theCSI-RS may be sued for fine beam management. The SSB may be used forboth the Tx beam sweeping and the Rx beam sweeping.

The Rx beam sweeping using the SSB may be performed while the UE changesthe Rx beam for the same SSBRI across multiple SSB bursts. Here, one SSburst includes one or more SSBs and one SS burst set includes one ormore SSB bursts.

DL BM using SSB

FIG. 11 is a flowchart showing an example of a downlink beam managementprocedure.

A configuration for beam report using the SSB is performed during aCSI/beam configuration in an RRC connected state (or RRC connectedmode).

-   -   The UE receives from the BS CSI-ResourceConfig IE including        CSI-SSB-ResourceSetList including SSB resources used for the BM        (S910).

Table 7 shows an example of CSI-ResourceConfig IE and as shown in TableA, a BM configuration using the SSB is not separately defined and theSSB is configured like the CSI-RS resource.

TABLE 7 -- ASN1START -- TAG-CSI-RESOURCECONFIG-START CSI-ResourceConfig::= SEQUENCE {  csi-ResourceConfigId CSI-ResourceConfigId, csi-RS-ResourceSetList  CHOICE {   nzp-CSI-RS-SSB  SEQUENCE {   nzp-CSI-RS-ResourceSetList   SEQUENCE (SIZE(1..maxNrofNZP-CSI-RS-ResourceSetsPerConfig)) OF NZP-CSI-RS-ResourceSetId  OPTIONAL,    csi-SSB-ResourceSetList  SEQUENCE (SIZE(1..maxNrofCSI-SSB-ResourceSetsPerConfig)) OF CSI- SSB-ResourceSetIdOPTIONAL   },   csi-IM-ResourceSetList  SEQUENCE (SIZE(1..maxNrofCSI-IM-ResourceSetsPerConfig)) OF CSI-IM-ResourceSetId  }, bwp-Id   BWP-Id,  resourceType  ENUMERATED { aperiodic, semiPersistent,periodic },  ... } -- TAG-CSI-RESOURCECONFIGTOADDMOD-STOP -- ASN1STOP

In Table 7, csi-SSB-ResourceSetList parameter represents a list of SSBresources used for beam management and reporting in one resource set.Here, SSB resource set may be configured as {SSBx1, SSBx2, SSBx3, SSBx4,. . . }. The SSB index may be defined as 0 to 63.

-   -   The UE receives, from the BS, the SSB resource based on the        CSI-SSB-ResourceSetList (S920).    -   When CSI-RS reportConfig associated with reporting of SSBRI and        L1-RSRP is configured, the UE (beam) reports to the BS best        SSBRI and L1-RSRP corresponding thereto (S930).

In other words, when reportQuantity of the CSI-RS reportConfig IE isconfigured as ‘ssb-Index-RSRP’, the UE reports to the BS best SSBRI andL1-RSRP corresponding thereto.

In addition, when the CSI-RS resource is configured in the same OFDMsymbol(s) as SSB (SS/PBCH Block) and ‘QCL-TypeD’ is applicable, the UEmay assume that the CSI-RS and the SSB are quasi co-located from theviewpoint of ‘QCL-TypeD’.

Here, the QCL TypeD may mean that antenna ports are QCL from theviewpoint of a spatial Rx parameter. When the UE receives a plurality ofDL antenna ports having a QCL Type D relationship, the same Rx beam maybe applied. Further, the UE does not expect that the CSI-RS isconfigured in an RE overlapped with the RE of the SSB.

DL BM Using CSI-RS

In respect to a CSI-RS usage, i) when a repetition parameter isconfigured in a specific CSI-RS resource set and TRS_info is notconfigured, the CSI-RS is used for the beam management. ii) When therepetition parameter is not configured and TRS_info is configured, theCSI-RS is used for a tracking reference signal (TRS). iii) When therepetition parameter is not configured and TRS_info is not configured,the CSI-RS is used for CSI acquisition.

The repetition parameter may be configured only for CSI-RS resource setsassociated with CSI-ReportConfig having a report of L1 RSRP or ‘NoReport (or None)’.

When the UE is configured with CSI-ReportConfig in which reportQuantityis configured as ‘cri-RSRP’ or ‘none’ and CSI-ResourceConfig (higherlayer parameter resourcesForChannelMeasurement) for channel measurementincludes not higher layer parameter ‘trs-Info’ butNZP-CSI-RS-ResourceSet in which higher layer parameter ‘repetition’ isconfigured, the UE may be configured only with the same number of port(1-port or 2-port) having higher layer parameter ‘nrofPorts’ for allCSI-RS resources in NZP-CSI-RS-ResourceSet.

When (higher layer parameter) repetition is configured to ‘ON’, (higherlayer parameter) repetition is associated with the Rx beam sweepingprocedure of the UE. In this case, when the UE is configured withNZP-CSI-RS-ResourceSet, the UE may assume that at least one CSI-RSresource in NZP-CSI-RS-ResourceSet is transmitted to the same downlinkspatial domain transmission filter. In other words, at least one CSI-RSresource in NZP-CSI-RS-ResourceSet is transmitted through the same Txbeam. Here, at least one CSI-RS resource in NZP-CSI-RS-ResourceSet maybe transmitted to different OFDM symbols. Further, the UE does notexpect that different periodicities are received at periodicityAndOffsetin all CSI-RS resources in NZP-CSI-RS-Resourceset.

On the contrary, when Repetition is configured to ‘OFF’, the Repetitionis associated with the Tx beam sweeping procedure of the BS. In thiscase, when repetition is configured to ‘OFF’, the UE does not assumethat at least one CSI-RS resource in NZP-CSI-RS-ResourceSet istransmitted to the same downlink spatial domain transmission filter. Inother words, at least one CSI-RS resource in NZP-CSI-RS-ResourceSet istransmitted through different Tx beams.

FIG. 12 illustrates an example of a downlink beam management procedureusing a Channel State Information-Reference Signal (CSI-RS).

FIG. 12(a) illustrates an Rx beam determination (or refinement)procedure of the UE and FIG. 12(b) illustrates a Tx beam sweepingprocedure of the BS. Further, FIG. 12(a) illustrates a case where therepetition parameter is configured to ‘ON’ and FIG. 12(b) illustrates acase where the repetition parameter is configured to ‘OFF’.

Referring to FIGS. 12(a) and 13, an Rx beam determination process of theUE will be described.

FIG. 13 is a flowchart showing an example of a receive beamdetermination process of a UE.

-   -   The UE receives, from the BS, NZP CSI-RS resource set IE        including higher layer parameter repetition through RRC        signaling (S1110). Here, the repetition parameter is configured        to ‘ON’.    -   The UE repeatedly receives a resource(s) in CSI-RS resource set        configured as repetition ‘ON’ in different OFDM symbols through        the same Tx beam (or DL spatial domain transmission filter) of        the BS (S1120).    -   The UE determines the Rx beam thereof (S1130).    -   The UE skips CSI report (S1140). In this case, reportQuantity of        CSI report config may be configured as ‘No report (or None)’.

In other words, the UE may skip the CSI report when repetition ‘ON’ isconfigured.

Referring to FIGS. 10(b) and 12, a Tx beam determination process of theBS will be described.

FIG. 14 is a flowchart showing an example of a transmit beamdetermination process of a BS.

-   -   The UE receives, from the BS, NZP CSI-RS resource set IE        including higher layer parameter repetition through RRC        signaling (S1210). Here, the repetition parameter is configured        to ‘OFF’ and associated with the Tx beam sweeping procedure of        the BS.    -   The UE receives a resource(s) in CSI-RS resource set configured        as repetition ‘OFF’ through different Tx beams (DL spatial        domain transmission filters) of the eNB (S1220).    -   The UE selects (or determines) a best beam (S1230).    -   The UE reports to the BS an ID for the selected beam and related        quality information (e.g., L1-RSRP) (S1240). In this case,        reportQuantity of CSI report config may be configured as        ‘CRI+L1-RSRP’.

In other words, when the CSI-RS is transmitted for the BM, the UEreports to the BS the CRI and L1-RSRP therefor.

FIG. 15 illustrates an example of resource allocation in time andfrequency domains related to a DL BM procedure using a CSI-RS.

Specifically, it can be seen that when repetition ‘ON’ is configured inthe CSI-RS resource set, a plurality of CSI-RS resources is repeatedlyused by applying the same Tx beam and when repetition ‘OFF’ isconfigured in the CSI-RS resource set, different CSI-RS resources aretransmitted by different Tx beams.

DL BM Related Beam Indication

The UE may be RRC-configured with a list for a maximum of M candidateTransmission Configuration Indication (TCI) states at least for apurpose of Quasi Co-location (QCL) indication. Here, the M may be 64.

Each TCI state may be configured as one RS set. One of DL RS typesincluding SSB, P-CSI RS, SP-CSI RS, A-CSI RS, and the like may be atleast referred to for an ID of each DL RS for a purpose of spatial QCL(QCL Type D) in the RS set.

Initialization/update of the ID of the DL RS(s) in the RS set used forthe purpose of the spatial QCL may be at least performed throughexplicit signaling.

Table 8 shows an example of TCI-State IE.

The TCI-State IE is associated with a quasi co-location (QCL) typecorresponding to one or two DL reference signals (RSs).

TABLE 8 -- ASN1START -- TAG-TCI-STATE-START TCI-State ::=  SEQUENCE { tci-StateId TCI-StateId,  qcl-Type1 QCL-Info,  qcl-Type2 QCL-InfoOPTIONAL, -- Need R  ... } QCL-Info ::=  SEQUENCE {  cell  ServCellIndex OPTIONAL, -- Need R  bwp-Id BWP-Id OPTIONAL,  -- Cond  CSI-RS-Indicated  referenceSignal   CHOICE {   csi-rs  NZP-CSI-RS-ResourceId,  ssb  SSB-Index  },  qcl-Type  ENUMERATED {typeA, typeB, typeC, typeD}, ... } -- TAG-TCI-STATE-STOP -- ASN1STOP

In Table 8, bwp-Id parameter represents DL BWP in which the RS islocated, cell parameter represents a carrier in which the RS is located,and reference signal parameter represents a reference antenna port(s)which becomes a source of quasi co-location for the corresponding targetantenna port(s) or a reference signaling including the same. The targetantenna port(s) may be CSI-RS, PDCCH DMRS, or PDSCH DMRS. As an example,corresponding TCI state ID may be indicated for NZP CSI-RS resourceconfiguration information in order to indicate QCL reference RSinformation for NZP CSI-RS. As another example, the TCI state ID may beindicated for each CORESET configuration in order to indicate QCLreference information for a PDCCH DMRS antenna port(s). As yet anotherexample, the TCI state ID may be indicated through DCI in order toindicate QCL reference information for a PDSCH DMRS antenna port(s).

Quasi-Co Location (QCL)

The antenna port is defined so that a channel in which the symbol on theantenna port is transported may be inferred from a channel in whichdifferent symbols on the same antenna port are transported. When aproperty of a channel in which a symbol on one antenna port istransported may be interred from a channel in which symbols on differentantenna ports are transported, two antenna ports may have a quasico-located or quasi co-location (QC/QCL) relationship.

Here, the channel property includes at least one of a delay spread, aDoppler spread, a frequency/Doppler shift, average received power,received timing/average delay, and a spatial Rx parameter. Here, thespatial Rx parameter means a spatial (receive) channel propertyparameter such as angle of arrival.

The UE may be configured as a list of up to M TCI-State configurationsin higher layer parameter PDSCH-Config in order to decode the PDSCHaccording to detected PDCCH having an intended DCI for the correspondingUE and a given serving cell. The M depends on a UE capability.

Each TCI-State includes a parameter for configuring a quasi co-locationrelationship between one or two DL reference signals and a DM-RS port ofthe PDSCH.

The quasi co-location relationship is configured as higher layerparameter qcl-Type1 for a first DL RS and qcl-Type2 (when configured)for a second DL RS. Two DL RSs are not the same as each other in termsof QCL type regardless of whether two DL RS are DL RSs having the samereference or DL RSs having different references.

A quasi co-location type corresponding to each DL RS may be given byhigher layer parameter qcl-Type of QCL-Info and may take one of thefollowing values.

-   -   ‘QCL-TypeA’: {Doppler shift, Doppler spread, average delay,        delay spread}    -   ‘QCL-TypeB’: {Doppler shift, Doppler spread}    -   ‘QCL-TypeC’: {Doppler shift, average delay}    -   ‘QCL-TypeD’: {Spatial Rx parameter}

For example, when a target antenna port is specific NZP CSI-RS,corresponding NZP CSI-RS antenna ports may be indicated/configured to beQCL with specific TRS from the viewpoint of QCL-Type A and specific SSBfrom the viewpoint of QCL-Type D. The UE that receives theindication/configuration may receive the corresponding NZP CSI-RS byusing a Doppler delay value measured in QCL-TypeA TRS and apply an Rxbeam used for receiving QCL-TypeD SSB to reception of the correspondingNZP CSI-RS.

The UE may receive an activation command by MAC CE signaling used formapping up to eight TCI states to codepoint of DCI field “TransmissionConfiguration Indication’.

UL BM

In the case of UL BM, beam reciprocity (or beam correspondence) betweenthe Tx beam and the Rx beam may be established or not establishedaccording to UE implementation. If the reciprocity between the Tx beamand the Tx beam is established in both the BS and the UE, a UL beam pairmay be matched through a DL beam pair. However, when the reciprocitybetween the Tx beam and the Rx beam is not established even in any oneof the BS and the UE, a UL beam pair determination process is requiredapart form DL beam pair determination.

Further, even when the BS and the UE maintain beam correspondence, theBS may use a UL BM procedure in order to determine a DL Tx beam withoutrequesting report of a preferred beam by the UE.

The UL BM may be performed through beamformed UL SRS transmission andwhether to apply UL BM of the SRS resource set is configured by a(higher layer parameter) usage. When the usage is configured as‘BeamManagement (BM)’, only one SRS resource may be transmitted to eachof a plurality of SRS resource sets at a given time instant.

The UE may be configured with one or more Sounding Reference Symbol(SRS) resource sets configured by (higher layer parameter)SRS-ResourceSet (through higher layer signaling, RRC signaling, etc.).For each SRS resource set, the UE may be configured with K (≥1) SRSresources (higher later parameter SRS-resources). Here, K is a naturalnumber and a maximum value of K is indicated by SRS_capability.

Similarly to the DL BM, a UL BM procedure may also be divided into Txbeam sweeping of the UE and Rx beam sweeping of the BS.

FIG. 16 illustrates an example of an uplink beam management procedureusing a Sounding Reference Signal (SRS). FIG. 16(a) illustrates an Rxbeam determination procedure of the BS and FIG. 16(b) illustrates a Txbeam sweeping procedure of the UE.

FIG. 17 is a flowchart showing an example of an uplink beam managementprocedure using the SRS.

-   -   The UE receives, from the BS, RRC signaling (e.g., SRS-Config        IE) including a (higher layer parameter) usage parameter        configured as ‘beam management’ (S1510).

Table 9 shows an example of SRS-Config Information Element (IE) andSRS-Config IE is used for an SRS transmission configuration. SRS-ConfigIE includes a list of SRS-Resources and a list of SRS-ResourceSets. EachSRS resource set means a set of SRS-resources.

The network may trigger transmission of the SRS resource set by usingconfigured aperiodicSRS-ResourceTrigger (L1 DCI).

TABLE 9 -- ASN1 START -- TAG-MAC-CELL-GROUP-CONFIG-START SRS-Config ::=   SEQUENCE {  srs-ResourceSetToReleaseList SEQUENCE(SIZE(1..maxNrofSRS-ResourceSets)) OF SRS-ResourceSetId  OPTIONAL,  --Need N  srs-ResourceSetToAddModList SEQUENCE(SIZE(1..maxNrofSRS-ResourceSets)) OF SRS-ResourceSet  OPTIONAL,  --Need N  srs-ResourceToReleaseList  SEQUENCE(SIZE(1..maxNrofSRS-Resources)) OF SRS-ResourceId  OPTIONAL,  -- Need N srs-ResourceToAddModList  SEQUENCE (SIZE(1..maxNrofSRS-Resources)) OFSRS-Resource  OPTIONAL,  -- Need N  tpc-Accumulation  ENUMERATED{disabled}  OPTIONAL, -- Need S  ... } SRS-ResourceSet ::= SEQUENCE { srs-ResourceSetId    SRS- ResourceSetId,  srs-ResourceIdList   SEQUENCE (SIZE(1..maxNrofSRS-ResourcesPerSet)) OF SRS-ResourceId   OPTIONAL,  -- Cond Setup  resourceType    CHOICE {   aperiodic SEQUENCE {    aperiodicSRS-ResourceTrigger    INTEGER(1..maxNrofSRS-TriggerStates-1),    csi-RS   NZP-CSI-RS-ResourceId           OPTIONAL,  --              Cond NonCodebook    slotOffset  INTEGER (1..32)             OPTIONAL,  -- Need S    ...   },  semi-persistent  SEQUENCE {    associatedCSI-RS  NZP-CSI-RS-ResourceId          OPTIONAL, -- Cond NonCodebook    ...   },   periodic  SEQUENCE{    associatedCSI-RS  NZP-CSI-RS-ResourceId           OPTIONAL, -- CondNonCodebook    ...   }  },  usage  ENUMERATED {beamManagement, codebook,nonCodebook, antennaSwitching},  alpha  Alpha OPTIONAL, -- Need S  p0 INTEGER (−202..24)                      OPTIONAL, -- Cond Setup pathlossReferenceRS CHOICE {   ssb-Index  SSB-Index,   csi-RS-Index NZP-CSI-RS-ResourceId SRS-SpatialRelationInfo ::=   SEQUENCE { servingCellId ServCellIndex  OPTIONAL,  -- Need S  referenceSignalCHOICE {   ssb-Index  SSB-Index,   csi-RS-Index NZP-CSI- RS-ResourceId,  srs  SEQUENCE {    resourceId  SRS-ResourceId,    uplinkBWP  BWP-Id  }  } } SRS-ResourceId ::=    INTEGER (0..maxNrofSRS-Resources-1)

In Table 9, usage represents a higher layer parameter indicating whetherthe SRS resource set is used for the beam management or whether the SRSresource set is used for codebook based or non-codebook basedtransmission. The usage parameter corresponds to L1 parameter‘SRS-SetUse’. ‘spatialRelationInfo’ is a parameter representing aconfiguration of a spatial relation between a reference RS and a targetSRS. Here, the reference RS may become SSB, CSI-RS, or SRS correspondingto L1 parameter ‘SRS-SpatialRelationInfo’. The usage is configured foreach SRS resource set.

-   -   The UE determines a Tx beam for an SRS resource to be        transmitted based on SRS-SpatialRelation Info included in the        SRS-Config IE (S1520). Here, SRS-SpatialRelation Info is        configured for each SRS resource and represents a beam which is        the same as the beam used in the SSB, the CSI-RS, or the SRS is        to be applied for each SRS resource. Further,        SRS-SpatialRelationInfo may be configured or not configured in        each SRS resource.    -   If SRS-SpatialRelationInfo is configured in the SRS resource,        SRS-SpatialRelationInfo is transmitted by applying the beam        which is the same as the beam used in the SSB, the CSI-RS, or        the SRS. However, if SRS-SpatialRelationInfo is not configured        in the SRS resource, the UE arbitrarily determines the Tx beam        and transmits the SRS through the determined Tx beam (S1530).

More specifically, for P-SRS in which ‘SRS-ResourceConfigType’ isconfigured as ‘periodic’:

i) When SRS-SpatialRelationInfo is configured as ‘SSB/PBCH’, the UEtransmits the corresponding SRS resource by applying a spatial domaintransmission filter which is the same as a spatial domain Rx filter usedfor receiving the SSB/PBCH (or generated from the corresponding filter);or

ii) When SRS-SpatialRelationInfo is configured as ‘CSI-RS’, the UEtransmits the SRS resource by applying the same spatial domaintransmission filter used for receiving periodic CSI-RS or SP CSI-RS; or

iii) When SRS-SpatialRelationInfo is configured as ‘SRS’, the UEtransmits the SRS resource by applying the same spatial domaintransmission filter used for transmitting the periodic CSI-RS.

Even when ‘SRS-ResourceConfigType’ is configured as ‘SP-SRS’ or‘AP-SRS’, beam determination and transmission operations may be appliedsimilarly thereto.

-   -   Additionally, the UE may receive or not receive a feedback for        the SRS from the BS like three following cases (S1540).

i) When Spatial Relation Info is configured for all SRS resources in theSRS resource set, the UE transmits the SRS with the beam indicated bythe BS. For example, when all Spatial Relation Info indicates the sameSSB, CRI, or SRI, the UE repeatedly transmits the SRS with the samebeam. This case as a usage of selecting the Rx beam by the BScorresponds to FIG. 16(a).

ii) Spatial_Relation_Info may not be configured for all SRS resources inthe SRS resource set. In this case, the UE may transmit the SRS whilearbitrarily changing the SRS beam. In other words, this case as a usageof sweeping the Tx beam by the UE corresponds to FIG. 16(b).

iii) Spatial_Relation_Info may be configured only for some SRS resourcesin the SRS resource set. In this case, the SRS may be transmitted withthe beam configured for the configured SRS resource and the UE mayarbitrarily transmit the SRS by applying the Tx beam to an SRS resourcein which Spatial_Relation_Info is not configured.

Channel State Information (CSI) Related Procedure

FIG. 18 is a flowchart showing an example of a CSI related procedure towhich a method proposed in the present disclosure may be applied.

In a New Radio (NR) system, a channel state information-reference signal(CSI-RS) is used for time and/or frequency tracking, CSI computation,layer 1 (L1)-reference signal received power (RSRP) computation, andmobility.

The expression of ‘A and/or B’ used in the present disclosure may beconstrued as the same meaning as ‘including at least one of A and B’.

The CSI computation is related to CSI acquisition and L1-RSRPcomputation is related to beam management (BM).

Channel state information (CSI) collectively refers to information thatmay indicate the quality of a radio channel (or referred to as a link)formed between the UE and the antenna port.

In order to perform one of usages of the CSI-RS, a terminal (e.g., userequipment (UE)) receives, from a base station (e.g., general Node B orgNB), configuration information related to the CSI through radioresource control (RRC) signaling (S1610).

The configuration information related to the CSI may include at leastone of CSI-interference management (IM) resource related information,CSI measurement configuration related information, CSI resourceconfiguration related information, CSI-RS resource related information,or CSI report configuration related information.

The CSI-IM resource related information may include CSI-IM resourceinformation, CSI-IM resource set information, and the like.

The CSI-IM resource set is identified by a CSI-IM resource setidentifier (ID) and one resource set includes at least one CSI-IMresource.

Each CSI-IM resource is identified by a CSI-IM resource ID.

The CSI resource configuration related information defines a groupincluding at least one of a non zero power (NZP) CSI-RS resource set, aCSI-IM resource set, or a CSI-SSB resource set.

In other words, the CSI resource configuration related information mayinclude a CSI-RS resource set list and the CSI-RS resource set list mayinclude at least one of a NZP

CSI-RS resource set list, a CSI-IM resource set list, or a CSI-SSBresource set list.

The CSI resource configuration related information may be expressed asCSI-ResourceConfig IE.

The CSI-RS resource set is identified by a CSI-RS resource set ID andone resource set includes at least one CSI-RS resource.

Each CSI-RS resource is identified by a CSI-RS resource ID.

As shown in Table 10, parameters (e.g., a BM related ‘repetition’parameter and a tracking related ‘trs-Info’ parameter) representing theusage may be configured for each NZP CSI-RS resource set.

Table 10 shows an example of NZP CSI-RS resource set IE.

TABLE 10 -- ASN1START -- TAG-NZP-CSI-RS-RESOURCESET-STARTNZP-CSI-RS-ResourceSet ::=  SEQUENCE {  nzp-CSI-ResourceSetId  NZP-CSI-RS-ResourceSetId,  nzp-CSI-RS-Resources   SEQUENCE (SIZE(1..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId, repetition  ENUMERATED { on, off } OPTIONAL,  aperiodicTriggeringOffset  INTEGER(0..4) OPTIONAL,  -- Need S  trs-Info ENUMERATED {true} OPTIONAL, -- Need R  ... } -- TAG-NZP-CSI-RS-RESOURCESET-STOP --ASN1STOP

In Table 10, repetition parameter as a parameter representing whetherthe same beam is repeatedly transmitted indicates whether the repetitionis ‘ON’ or ‘OFF’ for each NZP CSI-RS resource set.

The Tx beam used in the present disclosure may be construed as the samemeaning as the spatial domain transmission filter and the Rx beam may beconstrued as the same meaning as the spatial domain reception filter.

For example, when the repetition parameter of Table 10 is configured to‘OFF’, the UE does not assume that the NZP CSI-RS resource(s) in theresource set are transmitted with the same spatial domain transmissionfilter and the same Nrofports in all symbols.

In addition, the repetition parameter corresponding to the higher layerparameter corresponds to ‘CSI-RS-ResourceRep’ of L1 parameter.

The CSI report configuration related information includes areportConfigType parameter representing a time domain behavior and areportQuantity parameter representing a CSI related quantity forreporting.

The time domain behavior may be periodic, aperiodic, or semi-persistent.

In addition, the CSI report configuration related information may beexpressed as CSI-ReportConfig IE and Table 11 below shows an example ofCSI-ReportConfig IE.

TABLE 11 -- ASN1START -- TAG-CSI-RESOURCECONFIG-START CSI-ReportConfig::= SEQUENCE {  reportConfigId CSI- ReportConfigId,  carrier ServCellIndex  OPTIONAL, -- Need S  resourcesForChannelMeasurement   CSI- ResourceConfigId,  csi-IM-ResourcesForInterference  CSI-ResourceConfigId  OPTIONAL,  -- Need R nzp-CSI-RS-ResourcesForInterference   CSI-ResourceConfigId  OPTIONAL, -- Need R  reportConfigType CHOICE {   periodic  SEQUENCE {reportSlotConfig  CSI-ReportPeriodicityAndOffset, pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource   },  semiPersistentOnPUCCH  SEQUENCE { reportSlotConfig CSI-ReportPeriodicityAndOffset, pucch-CSI-ResourceList  SEQUENCE (SIZE(1..maxNrofBWPs)) OF PUCCH-CSI-Resource   },   semiPersistentOnPUSCH SEQUENCE { reportSlotConfig  ENUMERATED {sl5, sl10, sl20, sl40, sl80,sl160, sl320}, reportSlotOffsetList SEQUENCE (SIZE (1..maxNrofUL-Allocations)) OF INTEGER(0..32), p0alpha   P0-PUSCH-AlphaSetId  },   aperiodic  SEQUENCE { reportSlotOffsetList SEQUENCE (SIZE(1..maxNrofUL-Allocations)) OF INTEGER(0..32)   }  },  reportQuantityCHOICE {   none  NULL,   cri-RI-PMI-CQI  NULL,   cri-RI-i1  NULL,  cri-RI-i1-CQI  SEQUENCE { pdsch-BundleSizeForCSI  ENUMERATED {n2, n4}OPTIONAL   },   cri-RI-CQI  NULL,   cri-RSRP  NULL,   ssb-Index-RSRP NULL,   cri-RI-LI-PMI-CQI  NULL  },

In addition, the UE measures CSI based on configuration informationrelated to the CSI (S1620).

The CSI measurement may include (1) a CSI-RS reception process (S1622)and (2) a process of computing the CSI through the received CSI-RS(S1624).

A sequence for the CSI-RS is generated by Equation 6 below and aninitialization value of pseudo-random sequence C(i) is defined byEquation 6.

$\begin{matrix}{\mspace{79mu} {{r(m)} = {{\frac{1}{\sqrt{2}}( {1 - {2 \cdot {c( {2m} )}}} )} + {j\frac{1}{\sqrt{2}}( {1 - {2 \cdot {c( {{2m} + 1} )}}} )}}}} & \lbrack {{Equation}\mspace{14mu} 6} \rbrack \\{c_{init} = {( {{2^{10}( {{N_{symb}^{slot}n_{s,f}^{\mu}} + 1 + 1} )( {{2n_{ID}} + 1} )} + n_{ID}} )\; {mod}\; 2^{31}}} & \lbrack {{Equation}\mspace{14mu} 7} \rbrack\end{matrix}$

In Equations 6 and 7, n_(s,f) ^(μ) represents a slot number in a radioframe and pseudo-random sequence generator is initialized to Cant at astart of each OFDM symbol which is n_(s,f) ^(μ).

In addition, 1 represents an OFDM symbol number in the slot and n_(ID)is the same as higher-layer parameter scramblingID.

In addition, for the CSI-RS, resource element (RE) mapping is configuredtime and frequency domains by higher layer parameterCSI-RS-ResourceMapping.

Table 12 shows an example of CSI-RS-ResourceMapping IE.

TABLE 12 -- ASN1 START -- TAG-CSI-RS-RESOURCEMAPPING-STARTCSI-RS-ResourceMapping ::= SEQUENCE {  frequencyDomainAllocation  CHOICE{   row1 BIT STRING (SIZE (4)),   row2 BIT STRING (SIZE (12)),   row4BIT STRING (SIZE (3)),   other BIT STRING (SIZE (6))  },  nrofPorts ENUMERATED {p1,p2,p4,p8,p12,p16,p24,p32},  firstOFDMSymbolInTimeDomain  INTEGER (0..13),  firstOFDMSymbolInTimeDomain2  INTEGER (2..12)   OPTIONAL,  -- Need R  cdm-Type  ENUMERATED {noCDM, fd-CDM2,cdm4-FD2-TD2,  cdm8-FD2-TD4},  density     CHOICE {   dot5  ENUMERATED{evenPRBs, oddPRBs},   one  NULL,   three  NULL,   spare  NULL  }, freqBand     CSI- FrequencyOccupation,  ... }

In Table 12, a density (D) represents a density of the CSI-RS resourcemeasured in RE/port/physical resource block (PRB) and nrofPortsrepresents the number of antenna ports.

Further, the UE reports the measured CSI to the BS (S12030).

Here, when a quantity of CSI-ReportConfig of Table 12 is configured to‘none (or No report)’, the UE may skip the report.

However, even when the quantity is configured to ‘none (or No report)’,the UE may report the measured CSI to the BS.

The case where the quantity is configured to ‘none (or No report)’ is acase of triggering aperiodic TRS or a case where repetition isconfigured.

Here, only in a case where the repetition is configured to ‘ON’, the UEmay be defined to skip the report.

In summary, in the case where the repetition is configured to ‘ON’ and‘OFF’, ‘No report’, ‘SSB Resource Indicator (SSBRI) and L1-RSRP’, and‘CSI-RS Resource Indicator (CRI) and L1-RSRP’ may be all available asthe CSI report.

Alternatively, in the case where the repetition is ‘OFF’, CSI report of‘SSBRI and L1-RSRP’ or ‘CRT and L1-RSRP’ may be defined to betransmitted and in the case where the repetition is ‘ON’, ‘No report’,‘SSBRI and L1-RSRP’, or ‘CRT and L1-RSRP’ may be defined to betransmitted.

CSI Measurement and Reporting Procedure

The NR system supports more flexible and dynamic CSI measurement andreporting.

The CSI measurement may include a procedure of acquiring the CSI byreceiving the CSI-RS and computing the received CSI-RS.

As time domain behaviors of the CSI measurement and reporting,aperiodic/semi-persistent/periodic channel measurement (CM) andinterference measurement (IM) are supported.

A 4 port NZP CSI-RS RE pattern is used for configuring the CSI-IM.

CSI-IM based IMR of the NR has a similar design to the CSI-IM of the LTEand is configured independently of ZP CSI-RS resources for PDSCH ratematching.

In addition, in ZP CSI-RS based IMR, each port emulates an interferencelayer having (a preferable channel and) precoded NZP CSI-RS.

This is for intra-cell interference measurement with respect to amulti-user case and primarily targets MU interference.

The BS transmits the precoded NZP CSI-RS to the UE on each port of theconfigured NZP CSI-RS based IMR.

The UE assumes a channel/interference layer for each port and measuresinterference.

In respect to the channel, when there is no PMI and RI feedback,multiple resources are configured in a set and the base station or thenetwork indicates a subset of NZP CSI-RS resources through the DCI withrespect to channel/interference measurement.

Resource setting and resource setting configuration will be described inmore detail.

Resource Setting

Each CSI resource setting ‘CSI-ResourceConfig’ includes a configurationfor S≥1

CSI resource set (given by higher layer parametercsi-RS-ResourceSetList).

Here, the CSI resource setting corresponds to theCSI-RS-resourcesetlist.

Here, S represents the number of configured CSI-RS resource sets.

Here, the configuration for S≥1 CSI resource set includes each CSIresource set including CSI-RS resources (constituted by NZP CSI-RS orCSI IM) and an SS/PBCH block (SSB) resource used for L1-RSRPcomputation.

Each CSI resource setting is positioned in a DL bandwidth part (BWP)identified by a higher layer parameter bwp-id.

In addition, all CSI resource settings linked to CSI reporting settinghave the same DL BWP.

A time domain behavior of the CSI-RS resource within the CSI resourcesetting included in CSI-ResourceConfig IE is indicated by higher layerparameter resourceType and may be configured to be aperiodic, periodic,or semi-persistent.

The number S of configured CSI-RS resource sets is limited to ‘1’ withrespect to periodic and semi-persistent CSI resource settings.

Periodicity and slot offset which are configured are given in numerologyof associated DL BWP as given by bwp-id with respect to the periodic andsemi-persistent CSI resource settings.

When the UE is configured as multiple CSI-ResourceConfigs including thesame NZP CSI-RS resource ID, the same time domain behavior is configuredwith respect to CSI-ResourceConfig.

When the UE is configured as multiple CSI-ResourceConfigs including thesame CSI-IM resource ID, the same time domain behavior is configuredwith respect to CSI-ResourceConfig.

Next, one or more CSI resource settings for channel measurement (CM) andinterference measurement (IM) are configured through higher layersignaling.

-   -   CSI-IM resource for interference measurement.    -   NZP CSI-RS resource for interference measurement.    -   NZP CSI-RS resource for channel measurement.

That is, channel measurement resource (CMR) may be NZP CSI-RS andinterference measurement resource (IMR) may be NZP CSI-RS for CSI-IM andIM.

Here, CSI-IM (or ZP CSI-RS for IM) is primarily used for inter-cellinterference measurement.

In addition, NZP CSI-RS for IM is primarily used for intra-cellinterference measurement from multi-users.

The UE may assume CSI-RS resource(s) for channel measurement andCSI-IM/NZP CSI-RS resource(s) for interference measurement configuredfor one CSI reporting are ‘QCL-TypeD’ for each resource.

Resource Setting Configuration

As described, the resource setting may mean a resource set list.

In each trigger state configured by using higher layer parameterCSI-AperiodicTriggerState with respect to aperiodic CSI, eachCSI-ReportConfig is associated with one or multiple CSI-ReportConfigslinked to the periodic, semi-persistent, or aperiodic resource setting.

One reporting setting may be connected with a maximum of three resourcesettings.

-   -   When one resource setting is configured, the resource setting        (given by higher layer parameter resourcesForChannelMeasurement)        is used for channel measurement for L1-RSRP computation.    -   When two resource settings are configured, a first resource        setting (given by higher layer parameter        resourcesForChannelMeasurement) is used for channel measurement        and a second resource setting (given by        csi-IM-ResourcesForInterference or        nzp-CSI-RS-ResourcesForInterference) is used for interference        measurement performed on CSI-IM or NZP CSI-RS.    -   When three resource settings are configured, a first resource        setting (given by resourcesForChannelMeasurement) is for channel        measurement, a second resource setting (given by        csi-IM-ResourcesForInterference) is for CSI-IM based        interference measurement, and a third resource setting (given by        nzp-CSI-RS-ResourcesForInterference) is for NZP CSI-RS based        interference measurement.

Each CSI-ReportConfig is linked to periodic or semi-persistent resourcesetting with respect to semi-persistent or periodic CSI.

-   -   When one resource setting (given by        resourcesForChannelMeasurement) is configured, the resource        setting is for channel measurement for L1-RSRP computation.    -   When two resource settings are configured, a first resource        setting (given by resourcesForChannelMeasurement) is used for        channel measurement and a second resource setting (given by        higher layer parameter csi-IM-ResourcesForInterference) is used        for interference measurement performed on CSI-IM.

CSI measurement related CSI computation will be described.

When interference measurement is performed on CSI-IM, each CSI-RSresource for channel measurement is associated with the CSI-IM resourcefor each resource by an order of CSI-RS resources and CSI-IM resourceswithin a corresponding resource set.

The number of CSI-RS resources for channel measurement is equal to thenumber of CSI-IM resources.

In addition, when the interference measurement is performed in the NZPCSI-RS, the UE does not expect to be configured as one or more NZPCSI-RS resources in the associated resource set within the resourcesetting for channel measurement.

A UE in which Higher layer parameter nzp-CSI-RS-ResourcesForInterferenceis configured does not expect that 18 or more NZP CSI-RS ports will beconfigured in the NZP CSI-RS resource set.

For CSI measurement, the UE assumes the followings.

-   -   Each NZP CSI-RS port configured for interference measurement        corresponds to an interference transport layer.    -   In all interference transport layers of the NZP CSI-RS port for        interference measurement, an energy per resource element (EPRE)        ratio is considered.    -   Different interference signals on RE(s) of the NZP CSI-RS        resource for channel measurement, the NZP CSI-RS resource for        interference measurement, or CSI-IM resource for interference        measurement.

A CSI reporting procedure will be described in more detail.

For CSI reporting, time and frequency resources which may be used by theUE are controlled by the BS.

The channel state information (CSI) may include at least one of achannel quality indicator (CQI), a precoding matrix indicator (PMI), aCSI-RS resource indicator (CRI), an SS/PBCH block resource indicator(SSBRI), a layer indicator (LI), a rank indicator (RI), and L1-RSRP.

For the CQI, PMI, CRI, SSBRI, LI, RI, and L1-RSRP, the UE is configuredby a higher layer as N≥1 CSI-ReportConfig reporting setting, M≥1CSI-ResourceConfig resource setting, and a list (provided byaperiodicTriggerStateList and semiPersistentOnPUSCH) of one or twotrigger states.

In the aperiodicTriggerStateList, each trigger state includes thechannel and an associated CSI-ReportConfigs list optionally indicatingresource set IDs for interference.

In the semiPersistentOnPUSCH-TriggerStateList, each trigger stateincludes one associated CSI-ReportConfig.

In addition, the time domain behavior of CSI reporting supportsperiodic, semi-persistent, and aperiodic.

Hereinafter, each of periodic, semi-persistent (SP), and aperiodic CSIreporting will be described.

The periodic CSI reporting is performed on short PUCCH and long PUCCH.

The periodicity and slot offset of the periodic CSI reporting may beconfigured as RRC and refer to the CSI-ReportConfig IE.

Next, SP CSI reporting is performed on short PUCCH, long PUCCH, orPUSCH.

In the case of SP CSI on the short/long PUCCH, the periodicity and theslot offset are configured as the RRC and the CSI reporting to separateMAC CE is activated/deactivated.

In the case of the SP CSI on the PUSCH, the periodicity of the SP CSIreporting is configured through the RRC, but the slot offset is notconfigured through the RRC and the SP CSI reporting isactivated/deactivated by DCI (format 0_1).

An initial CSI reporting timing follows a PUSCH time domain allocationvalue indicated in the DCI and a subsequent CSI reporting timing followsa periodicity configured through the RRC.

Separated RNTI (SP-CSI C-RNTI) is used with respect to the SP CSIreporting on the PUSCH.

DCI format 0_1 may include a CSI request field and mayactivate/deactivate a specific configured SP-CSI trigger state.

In addition, the SP CSI reporting has the same or similaractivation/deactivation as a mechanism having data transmission on SPSPUSCH.

Next, the aperiodic CSI reporting is performed on the PUSCH and istriggered by the DCI.

In the case of AP CSI having AP CSI-RS, an AP CSI-RS timing isconfigured by the RRC.

Here, a timing for the AP CSI reporting is dynamically controlled by theDCI.

The NR does not adopt a scheme (for example, transmitting RI, WBPMI/CQI, and SB PMI/CQI in order) of dividing and reporting the CSI inmultiple reporting instances applied to PUCCH based CSI reporting in theLTE.

Instead, the NR restricts specific CSI reporting not to be configured inthe short/long PUCCH and a CSI omission rule is defined.

In addition, in relation with the AP CSI reporting timing, a PUSCHsymbol/slot location is dynamically indicated by the DCI. In addition,candidate slot offsets are configured by the RRC.

For the CSI reporting, slot offset(Y) is configured for each reportingsetting.

For UL-SCH, slot offset K2 is configured separately.

Two CSI latency classes (low latency class and high latency class) aredefined in terms of CSI computation complexity.

The low latency CSI is a WB CSI that includes up to 4 ports Type-Icodebook or up to 4-ports non-PMI feedback CSI.

The high latency CSI refers to CSI other than the low latency CSI.

For a normal UE, (Z, Z′) is defined in a unit of OFDM symbols.

Z represents a minimum CSI processing time from the reception of theaperiodic CSI triggering DCI to the execution of the CSI reporting.

Z′ represents a minimum CSI processing time from the reception of theCSI-RS for channel/interference to the execution of the CSI reporting.

Additionally, the UE reports the number of CSIs which may besimultaneously calculated.

Hereinafter, Table 13 shows a CSI reporting configuration defined inTS38.214.

TABLE 13 5.2.1.4 Reporting configurations The UE shall calculate CSIparameters (if reported) assuming the following dependencies between CSIparameters (if reported) LI shall be calculated conditioned on thereported CQI, PMI, RI and CRI CQI shall be calculated conditioned on thereported PMI, RI and CRI PMI shall be calculated conditioned on thereported RI and CRI RI shall be calculated conditioned on the reportedCRI. The Reporting configuration for CSI can be aperiodic (using PUSCH),periodic (using PUCCH) or semi-persistent (using PUCCH, and DCIactivated PUSCH). The CSI-RS Resources can be periodic, semi-persistent,or aperiodic. Table 5.2.1.4-1 shows the supported combinations of CSIReporting configurations and CSI-RS Resource configurations and how theCSI Reporting is triggered for each CSI-RS Resource configuration.Periodic CSI-RS is configured by higher layers. Semi-persistent CSI-RSis activated and deactivated as described in Subclause 5.2.1.5.2.Aperiodic CSI-RS is configured and triggered/activated as described inSubclause 5.2.1.5.1. Table 5.2.1.4-1: Triggering/Activation of CSIReporting for the possible CSI-RS Configurations. Periodic CSISemi-Persistent CSI Aperiodic CSI-RS Configurations Reporting ReportingReporting Periodic CSI-RS No dynamic For reporting on Triggered by DCI;triggering/activation PUCCH, the UE additionally, activation receives anactivation command [10, TS command [10, TS 38.321] possible as 38.321];for reporting defined in Subclause on PUSCH, the UE 5.2.1.5.1. receivestriggering on DCI Semi-Persistent CSI-RS Not Supported For reporting onTriggered by DCI; PUCCH, the UE additionally, activation receives anactivation command [10, TS command [10, TS 38.321] possible as 38.321];for reporting defined in Subclause on PUSCH, the UE 5.2.1.5.1. receivestriggering on DCI Aperiodic CSI-RS Not Supported Not Supported Triggeredby DCI; additionally, activation command [10, TS 38.321] possible asdefined in Subclause 5.2.1.5.1.

Further, Table 14 below shows information related toactivation/deactivation/trigger by MAC-CE related toSemi-Persistent/Aperiodic CSI reporting defined in TS38.321.

TABLE 14 5.18.2 Activation/Deactivation of Semi-persistent CSI-RS/CSI-IMresource set The network may activate and deactivate the configuredSemi-persistent CSI-RS/CSI- IM resource sets of a Serving Cell bysending the SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CEdescribed in subclause 6.1.3.12. The configured Semi-persistentCSI-RS/CSI-IM resource sets are initially deactivated upon configurationand after a handover. The MAC entity shall: if the MAC entity receivesan SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE on aServing Cell: 2> indicate to lower layers the information regarding theSP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE. 5.18.3Aperiodic CSI Trigger State subselection The network may select amongthe configured aperiodic CSI trigger states of a Serving Cell by sendingthe Aperiodic CSI Trigger State Subselection MAC CE described insubclause 6.1.3.13. The MAC entity shall: if the MAC entity receives anAperiodic CSI trigger State Subselection MAC CE on a Serving Cell: 2>indicate to lower layers the information regarding Aperiodic CSI triggerState Subselection MAC CE.

Downlink Transmission/Reception Operation

FIG. 19 is a diagram illustrating an example of a downlinktransmission/reception operation between a BS and a UE.

-   -   The BS schedules downlink transmission such as a frequency/time        resource, a transport layer, a downlink precoder, MCS, etc.,        (S1901). In particular, the BS may determine a beam for PDSCH        transmission to the UE through the above-described operations.    -   The UE receives Downlink Control Information (DCI) for downlink        scheduling (i.e., including scheduling information of the PDSCH)        on the PDCCH (S1902).

DCI format 1_0 or 1_1 may be used for the downlink scheduling and inparticular, DCI format 1_1 includes the following information:

Identifier for DCI formats, Bandwidth part indicator, Frequency domainresource assignment, Time domain resource assignment, PRB bundling sizeindicator, Rate matching indicator, ZP CSI-RS trigger, Antenna port(s),Transmission configuration indication (TCI), SRS request, andDemodulation Reference Signal (DMRS) sequence initialization.

In particular, according to each state indicated in an antenna port(s)field, the number of DMRS ports may be scheduled and Single-user(SU)/Multi-user (MU) transmission scheduling is also available.

Further, a TCI field is configured by 3 bits and a maximum of 8 TCIstates are indicated according to a TCI field value to dynamically theQCL for the DMRS.

-   -   The UE receives downlink data from the BS on the PDSCH (S1903).

When the UE detects a PDCCH including DCI format 1_0 or 1_1, the UEdecodes the PDSCH according to the indication by the corresponding DCI.

Here, when the UE receives a PDSCH scheduled by DCI format 1, a DMRSconfiguration type may be configured by higher layer parameter‘dmrs-Type’ in the UE and the DMRS type is used for receiving the PDSCH.Further, in the UE, the maximum number of front-loaded DMRS symbols forthe PDSCH may be configured by higher layer parameter ‘maxLength’.

In the case of DMRS configuration type 1, when a single codeword isscheduled and an antenna port mapped to an index of {2, 9, 10, 11, or30} is designated in the UE or when two codewords are scheduled in theUE, the UE assumes that all remaining orthogonal antenna ports are notassociated with PDSCH transmission to another UE.

Alternatively, in the case of DMRS configuration type 2, when a singlecodeword is scheduled and an antenna port mapped to an index of {2, 10,or 23} is designated in the UE or when two codewords are scheduled inthe UE, the UE assumes that all remaining orthogonal antenna ports arenot associated with PDSCH transmission to another UE.

When the UE receives the PDSCH, a precoding granularity P′ may beassumed as a consecutive resource block in the frequency domain. Here,P′ may correspond to one value of {2, 4, and wideband}.

When P′ is determined as wideband, the UE does not predict that thePDSCH is scheduled to non-contiguous PRBs and the UE may assume that thesame precoding is applied to the allocated resource.

On the contrary, when P′ is determined as any one of {2 and 4}, aPrecoding Resource Block Group (PRG) is split into P′ consecutive PRBs.The number of actually consecutive PRBs in each PRG may be one or more.The UE may assume that the same precoding is applied to consecutivedownlink PRBs in the PRG

In order to determine a modulation order in the PDSCH, a target coderate, and a transport block size, the UE first reads a 5-bit MCD fieldin the DCI and determines the modulation order and the target code rate.In addition, the UE reads a redundancy version field in the DCI anddetermines a redundancy version. In addition, the UE determines thetransport block size by using the number of layers before rate matchingand the total number of allocated PRBs.

Uplink Transmission/Reception Operation

FIG. 20 is a diagram illustrating an example of an uplinktransmission/reception operation between a BS and a UE.

-   -   The BS schedules uplink transmission such as the frequency/time        resource, the transport layer, an uplink precoder, the MCS, etc.        (S2001). In particular, the BS may determine a beam for PUSCH        transmission of the UE through the above-described operations.    -   The UE receives, from the BS, DCI for downlink scheduling (i.e.,        including scheduling information of the PUSCH) on the PDCCH        (S2002).

DCI format 0_0 or 0_1 may be used for the uplink scheduling and inparticular, DCI format 0_1 includes the following information whichincludes:

Identifier for DCI formats, UL/Supplementary uplink (SUL) indicator,Bandwidth part indicator, Frequency domain resource assignment, Timedomain resource assignment, Frequency hopping flag, Modulation andcoding scheme (MCS), SRS resource indicator (SRI), Precoding informationand number of layers, Antenna port(s), SRS request, DMRS sequenceinitialization, and Uplink Shared Channel (UL-SCH) indicator

In particular, configured SRS resources in an SRS resource setassociated with higher layer parameter ‘usage’ may be indicated by anSRS resource indicator field. Further, ‘spatialRelationInfo’ may beconfigured for each SRS resource and a value of ‘spatialRelationInfo’may be one of {CRI, SSB, and SRI}.

Two transmission schemes, i.e., codebook based transmission andnon-codebook based transmission are supported for PUSCH transmission.

i) When higher layer parameter ‘txConfig’ is set to ‘codebook’, the UEis configured to the codebook based transmission. On the contrary, whenhigher layer parameter ‘txConfig’ is set to ‘nonCodebook’, the UE isconfigured to the non-codebook based transmission. When higher layerparameter ‘txConfig’ is not configured, the UE does not predict that thePUSCH is scheduled by DCI format 0_1. When the PUSCH is scheduled by DCIformat 0_0, the PUSCH transmission is based on a single antenna port.

In the case of the codebook based transmission, the PUSCH may bescheduled by DCI format 0_0 or DCI format 0_1, or semi-statically. Whenthe PUSCH is scheduled by DCI format 0_1, the UE determines a PUSCHtransmission precoder based on the SRI, the Transmit Precoding MatrixIndicator (TPMI), and the transmission rank from the DCI as given by theSRS resource indicator field and the Precoding information and number oflayers field. The TPMI is used for indicating a precoder to be appliedover the antenna port and when multiple SRS resources are configured,the TPMI corresponds to the SRS resource selected by the SRI.Alternatively, when the single SRS resource is configured, the TPMI isused for indicating the precoder to be applied over the antenna port andcorresponds to the corresponding single SRS resource. A transmissionprecoder is selected from an uplink codebook having the same antennaport number as higher layer parameter ‘nrofSRS-Ports’. When the UE isconfigured with the higher layer parameter ‘txConfig’ set to ‘codebook’,at least one SRS resource is configured in the UE. An SRI indicated inslot n is associated with most recent transmission of the SRS resourceidentified by the SRI and here, the SRS resource precedes PDCCH (i.e.,slot n) carrying the SRI.

ii) In the case of the non-codebook based transmission, the PUSCH may bescheduled by DCI format 0_0 or DCI format 0_1, or semi-statically. Whenmultiple SRS resources are configured, the UE may determine the PUSCHprecoder and the transmission rank based on a wideband SRI and here, theSRI is given by the SRS resource indicator in the DCI or given by higherlayer parameter ‘srs-ResourceIndicator’. The UE may use one or multipleSRS resources for SRS transmission and here, the number of SRS resourcesmay be configured for simultaneous transmission in the same RB based onthe UE capability. Only one SRS port is configured for each SRSresource. Only one SRS resource may be configured to higher layerparameter ‘usage’ set to ‘nonCodebook’. The maximum number of SRSresources which may be configured for non-codebook based uplinktransmission is 4. The SRI indicated in slot n is associated with mostrecent transmission of the SRS resource identified by the SRI and here,the SRS transmission precedes PDCCH (i.e., slot n) carrying the SRI.

The higher layer parameter ‘txConfig’ may be included in a specifichigher layer parameter. The specific higher layer parameter may be‘PUSCH config’. The ‘PUSCH config’ may be included in PUSCH configinformation element (IE) and used for configuring specific PUSCHparameters applicable to a BWP specific for the UE. PUSCH config IE maybe configured as shown in Table 15 below.

TABLE 15 PUSCH-Config information element -- ASN1START --TAG-PUSCH-CONFIG-START PUSCH-Config ::= SEQUENCE { dataScramblingIdentityPUSCH     INTEGER (0..1023) OPTIONAL,  -- Need S txConfig   ENUMERATED {codebook, nonCodebook}  OPTIONAL,  -- Need S dmrs-UplinkForPUSCH-MappingTypeA    SetupRelease { DMRS- UplinkConfig } OPTIONAL,  -- Need M  dmrs-UplinkForPUSCH-MappingTypeB    SetupRelease{ DMRS- UplinkConfig }  OPTIONAL, -- Need M  pusch-PowerControl    PUSCH-PowerControl OPTIONAL, -- Need M  frequencyHopping  ENUMERATED {intraSlot, interSlot}  OPTIONAL,  -- Need S frequencyHoppingOffsetLists   SEQUENCE (SIZE (1..4)) OF INTEGER (1..maxNrofPhysicalResourceBlocks-1) OPTIONAL,  -- Need M resourceAllocation        ENUMERATED { resourceAllocationType0,resourceAllocationType1, dynamicSwitch},  pusch-TimeDomainAllocationList    SetupRelease  { PUSCH- TimeDomainResourceAllocationList }  OPTIONAL,  -- Need M  pusch-AggregationFactor  ENUMERATED { n2, n4, n8} OPTIONAL,  -- Need S  mcs-Table     ENUMERATED  {qam256, qam64LowSE}     OPTIONAL, -- Need S  mcs-TableTransformPrecoder     ENUMERATED {qam256, qam64LowSE}      OPTIONAL, -- Need S  transformPrecoder    ENUMERATED  {enabled, disabled}    OPTIONAL,  -- Need S codebookSubset        ENUMERATED {fullyAndPartialAndNonCoherent,partialAndNonCoherent,nonCoherent} OPTIONAL, -- Cond codebookBased maxRank       INTEGER (1..4) OPTIONAL, -- Cond codebookBased  rbg-Size   ENUMERATED  { config2} OPTIONAL, -- Need S  uci-OnPUSCH      SetupRelease { UCI- OnPUSCH}  OPTIONAL,  -- Need M  tp-pi2BPSK     ENUMERATED  {enabled} OPTIONAL, -- Need S  ... } UCI-OnPUSCH ::= SEQUENCE {  betaOffsets   CHOICE {   dynamic      SEQUENCE (SIZE (4))OF BetaOffsets,   semiStatic     BetaOffsets  } OPTIONAL, -- Need M scaling    ENUMERATED { f0p5, f0p65, f0p8, f1 } } --TAG-PUSCH-CONFIG-STOP -- ASN1STOP

Information included in the PUSCH Config field of Table 15 above isshown in Table 16 below.

TABLE 16 PUSCH-Config field descriptions codebookSubset Subset of PMIsaddressed by TPMI, where PMIs are those supported by UEs with maximumcoherence capabilities (see TS 38.214 [19], clause 6.1.1.1).dataScramblingIdentityPUSCH Identifier used to initalite data scrambling(c_init) for PUSCH. If the field is absent, the UE applies the physicalcell ID. (see TS 38.211 [16], clause 6.3.1.1).dmrs-UplinkForPUSCH-MappingTypeA DMRS configuration for PUSCHtransmissions using PUSCH mapping type A (chosen dynamically viaPUSCH-TimeDomainResourceAllocation). Only the fields dmrs-Type,dmrs-AdditionalPosition and maxLength may be set differently for mappingtype A and B. dmrs-UplinkForPUSCH-MappingTypeB DMRS configuration forPUSCH transmissions using PUSCH mapping type B (chosen dynamically viaPUSCH-TimeDomainResourceAllocation). Only the fields dmrs-Type,dmrs-AdditionalPosition and maxLength may be set differently for mappingtype A and B. frequencyHopping The value intraSlot enables ‘Intra-slotfrequency hopping’ and the value interSlot enables ‘Inter-slot frequencyhopping’. If the field is absent, frequency hopping is not configured(see TS 38.214 [19], clause 6.3). frequencyHoppingOffsetLists Set offrequency hopping offsets used when frequency hopping is enabled forgranted transmission (not msg3) and type 2 (see TS 38.214 [19], clause6.3). maxRank Subset of PMIs addressed by TRIs from 1 to ULmaxRank (seeTS 38.214 [19], clause 6.1.1.1). mcs-Table Indicates which MCS table theUE shall use for PUSCH without transform precoder (see TS 38.214 [19],clause 6.1.4.1). If the field is absent the UE applies the value 64QAMmcs-TableTransformPrecoder Indicates which MCS table the UE shall usefor PUSCH with transform precoding (see TS 38.214 [19], clause 6.1.4.1)If the field is absent the UE applies the value 64QAMpusch-AggregationFactor Number of repetitions for data (see TS 38.214[19], clause 6.1.2.1). If the field is absent the UE applies thevalue 1. pusch-TimeDomainAllocationList List of time domain allocationsfor timing of UL assignment to UL data (see TS 38.214 [19], table6.1.2.1.1-1). rbg-Size Selection between configuration 1 andconfiguration 2 for RBG size for PUSCH. The UE does not apply this fieldif resourceAllocation is set to resourceAllocationType1. Otherwise, theUE applies the value config1 when the field is absent (see TS 38.214[19], clause 6.1.2.2.1). resourceAllocation Configuration of resourceallocation type 0 and resource allocation type 1 for non-fallback DCI(see TS 38.214 [19], clause 6.1.2). tp-pi2BPSK Enables pi/2-BPSKmodulation with transform precoding if the field is present and disablesit otherwise. transformPrecoder The UE specific selection of transformerprecoder for PUSCH (see TS 38.214 [19], clause 6.1.3). When the field isabsent the UE applies the value of the field msg3- transformPrecoder.txConfig Whether UE uses codebook based or non-codebook basedtransmission (see TS 38.214 [19], clause 6.1.1). If the field is absent,the UE transmits PUSCH on one antenna port, see TS 38.214 [19], clause6.1.1.

Further, information included in the UCI-OnPUSCH field of Table 15 aboveis shown in Table 17 below.

TABLE 17 UCI-OnPUSCH field descriptions betaOffsets Selection betweenand configuration of dynamic and semi-static beta-offset. If the fieldis not configured, the UE applies the value ‘semiStatic’ (see TS 38.213[13], clause 9.3). scaling Indicates a scaling factor to limit thenumber of resource elements assigned to UCI on PUSCH. Value f0p5corresponds to 0.5, value f0p65 corresponds to 0.65, and so on. Thevalue configured herein is applicable for PUSCH with configured grant(see TS 38.212 [17], clause 6.3).

Further, when txConfig is configured to codebook, the codebookBasedfield of Table 15 above is requisitively present in PUSCHConfig,otherwise the codebookBased field is not present.

Uplink Transmission Codebook

The codeword may be transformed into a bit sequence scrambled by thescrambler. A scramble sequence used for scrambling may be generatedbased on an initialization value and the initialization value mayinclude ID information of a wireless device, etc. The scrambled bitsequence may be modulated into a modulated symbol sequence by themodulator. A complex modulated symbol sequence may be mapped to one ormore transport layers by the layer mapper. Modulated symbols of eachtransport layer may be mapped to a corresponding antenna port(s) by theprecoder. In this case, mapping the modulated symbols of each transportlayer to the antenna port(s) corresponds to precoding.

More specifically, the precoding may be performed by the followingequation.

$\begin{matrix}{\begin{bmatrix}{z^{(p_{0})}(i)} \\\vdots \\{z^{(p_{\rho - 1})}(i)}\end{bmatrix} = {W\begin{bmatrix}{y^{(0)}(i)} \\\vdots \\{y^{({\upsilon ­1})}(i)}\end{bmatrix}}} & \lbrack {{Equation}\mspace{14mu} 8} \rbrack\end{matrix}$

In the equation, i=0,1, . . . ,M_(symb) ^(ap)−1 and M_(symb) ^(ap)=MM_(symb) ^(layer) may be satisfied and W may be the precoding matrix.The precoding matrix may be expressed even as the precoder.

In non-codebook based transmission, the precoding matrix W may be a unitmatrix.

In codebook based transmission, the precoding matrix W may be 1 forsingle layer transmission (W=1). In other cases, i.e., for transmissionof 2 layers or more, the precoding matrix W may be acquired based onTables 18 to 24 below and downlink control information or a higher layerparameter for scheduling uplink transmission.

Further, when higher layer parameter txConfig is not configured, theprecoding matrix W may be 1 (W=1).

Table 18 below shows a codebook for the precoding matrix W for singlelayer transmission using two antenna ports.

TABLE 18 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-5 $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\0\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}0 \\1\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\1\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\{- 1}\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\j\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\{- j}\end{bmatrix}$ — —

A transmit precoding matrix indicator (TPMI) index is indexed accordingto ascending order from a left side to a right side of the table withrespect to the precoding matrices included in the codebook of Table 18.

Table 19 shows a codebook for the precoding matrix W for single layertransmission using four antenna ports. In particular, Table 19 relatesto a case where a configuration of a higher layer parameter (transformprecoder) is set to ‘enabled’.

TABLE 19 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- 1} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- j} \\{- j}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- 1} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- j} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\j \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- j} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\1\end{matrix} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\j\end{matrix} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\{- 1}\end{matrix} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\{- j}\end{matrix} \\1\end{bmatrix}$ — — — —

The transmit precoding matrix indicator (TPMI) index is indexedaccording to ascending order from a left side to a right side of thetable with respect to the precoding matrices included in the codebook ofTable 19.

Table 20 shows a codebook for the precoding matrix W for single layertransmission using four antenna ports. In particular, Table 20 relatesto a case where the configuration of the higher layer parameter(transform precoder) is set to ‘disabled’.

TABLE 20 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\0 \\{- 1}\end{matrix} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\0 \\{- j}\end{matrix} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}0 \\1 \\0\end{matrix} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}0 \\1 \\0\end{matrix} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\1 \\{- 1}\end{matrix} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\1 \\{- j}\end{matrix} \\{- j}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\j \\j\end{matrix} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\j \\{- 1}\end{matrix} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\j \\{- j}\end{matrix} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- 1} \\1\end{matrix} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- 1} \\j\end{matrix} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- 1} \\{- 1}\end{matrix} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- 1} \\{- j}\end{matrix} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\1\end{matrix} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\j\end{matrix} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\{- 1}\end{matrix} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}\begin{matrix}1 \\{- j} \\{- j}\end{matrix} \\{- 1}\end{bmatrix}$ — — — —

The transmit precoding matrix indicator (TPMI) index is indexedaccording to ascending order from a left side to a right side of thetable with respect to the precoding matrices included in the codebook ofTable 20.

Table 21 shows a codebook for precoding matrix W for rank 2 transmission(or 2 layer transmission) using two antenna ports. In particular, Table21 relates to a case where the configuration of the higher layerparameter (transform precoder) is set to ‘disabled’.

TABLE 21 TPMI W index (ordered from left to right in increasing order ofTPMI index) 0-2 $\frac{1}{\sqrt{2}}\begin{bmatrix}1 & 0 \\0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 1 \\1 & {- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 1 \\j & {- j}\end{bmatrix}$  

The transmit precoding matrix indicator (TPMI) index is indexedaccording to ascending order from a left side to a right side of thetable with respect to the precoding matrices included in the codebook ofTable 21.

Table 22 shows a codebook for the precoding matrix W for rank 4transmission (or 2 layer transmission) using four antenna ports. Inparticular, Table 22 relates to a case where the configuration of thehigher layer parameter (transform precoder) is set to ‘disabled’.

TABLE 22 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\0 & 0 \\0 & 0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 0 \\0 & 1 \\0 & 0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 0 \\0 & 0 \\0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 & 0 \\1 & 0 \\0 & 1 \\0 & 0\end{bmatrix}$ 4-7 $\frac{1}{2}\begin{bmatrix}0 & 0 \\1 & 0 \\0 & 0 \\0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 & 0 \\0 & 0 \\1 & 0 \\0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\1 & 0 \\0 & {- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\1 & 0 \\0 & j\end{bmatrix}$  8-11 $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\{- j} & 0 \\0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\{- j} & 0 \\0 & {- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\{- 1} & 0 \\0 & {- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\{- 1} & 0 \\0 & j\end{bmatrix}$ 12-15 $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\j & 0 \\0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 \\0 & 1 \\j & 0 \\0 & {- 1}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\1 & 1 \\1 & {- 1} \\1 & {- 1}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\1 & 1 \\j & {- j} \\j & {- j}\end{bmatrix}$ 16-19 $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\j & j \\1 & {- 1} \\j & {- j}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\j & j \\j & {- j} \\{- 1} & 1\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\{- 1} & {- 1} \\1 & {- 1} \\{- 1} & 1\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\{- 1} & {- 1} \\j & {- j} \\{- j} & j\end{bmatrix}$ 20-21 $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\{- j} & {- j} \\1 & {- 1} \\{- j} & j\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 \\{- j} & {- j} \\j & {- j} \\1 & {- 1}\end{bmatrix}$ — —

The transmit precoding matrix indicator (TPMI) index is indexedaccording to ascending order from a left side to a right side of thetable with respect to the precoding matrices included in the codebook ofTable 22.

Table 23 shows a codebook for precoding matrix W for rank 3 transmission(or 3 layer transmission) using four antenna ports. In particular, Table23 relates to a case where the configuration of the higher layerparameter (transform precoder) is set to ‘disabled’.

TABLE 23 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\0 & 0 & 1 \\0 & 0 & 0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\1 & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\{- 1} & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\1 & 1 & {- 1} \\1 & {- 1} & {- 1}\end{bmatrix}$ 4-6 $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\j & j & {- j} \\j & {- j} & {- j}\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\1 & 1 & {- 1} \\{- 1} & 1 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\j & j & {- j} \\{- j} & j & j\end{bmatrix}$ —

The transmit precoding matrix indicator (TPMI) index is indexedaccording to ascending order from a left side to a right side of thetable with respect to the precoding matrices included in the codebook ofTable 23.

Table 24 shows a codebook for precoding matrix W for rank 4 transmission(or 4 layer transmission) using four antenna ports. In particular, Table24 relates to a case where the configuration of the higher layerparameter (transform precoder) is set to ‘disabled’.

TABLE 24 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 & 0 \\0 & 1 & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\1 & {- 1} & 0 & 0 \\0 & 0 & 1 & {- 1}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\j & {- j} & 0 & 0 \\0 & 0 & j & {- j}\end{bmatrix}$ $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\1 & 1 & {- 1} & {- 1} \\1 & {- 1} & {- 1} & 1\end{bmatrix}$ 4 $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\j & j & {- j} & {- j} \\j & {- j} & {- j} & j\end{bmatrix}$ — — —

The transmit precoding matrix indicator (TPMI) index is indexedaccording to ascending order from a left side to a right side of thetable with respect to the precoding matrices included in the codebook ofTable 23.

Downlink control information for codebook based uplink transmission

Downlink control information (DCI) of format 0_1 may be used forscheduling a physical uplink shared channel (PUSCH) in one cell.Further, the downlink control information of format 0_1 may be used forcodebook based uplink transmission.

DCI format 0_1 having CRC scrambled to C-RNTI, CS-RNTI, SP-CSI-RNTI, orMCS-C-RNTI may include the following information.

-   -   Identifier for DCI formats—has a size of 1 bit    -   The field may be continuously configured to 0 in order to        indicate the UL DCI format.    -   Carrier indicator—has a size of 0 or 3 bits    -   UL/SUL indicator—has a size of 0 bit or 1 bit    -   Bandwidth part indicator—has a size of 0, 1 or 2 bits    -   Frequency domain resource assignment    -   Time domain resource assignment—has a size of 0, 1, 2, 3, or 4        bits    -   Frequency hopping flag—has a size of 0 or 1 bit    -   Modulation and coding scheme—has a size of 5 bits    -   New data indicator)—has a size of 1 bit    -   Redundancy version—has a size of 2 bits    -   HARQ process number—has a size of 4 bits    -   Command for TPC scheduled PUSCH—has a size of 2 bits    -   SRS resource indicator    -   Precoding information and number of layers

The size of the field ‘precoding information and number of layers’ maybe differently configured based on higher layer parameters and thenumber of antenna ports used for the uplink transmission by the UE. Thehigher layer parameters may include ‘txConfig’, ‘transform precoder’,‘maxRank’, and ‘codebooksubset’. Here, the ‘maxRank’ may be used toconfigure a maximum transmission rank which the UE may use for theuplink transmission. Further, information included in the‘codebooksubset’ may be determined based on capability informationrelated to a phase difference maintenance capability between antennaports of the UE, which the UE reports to the BS, and the BS may transmitthe ‘codebooksubset’ to the UE through a higher layer signaling. The UEmay determine a codebook subset for the uplink transmission based on the‘codebooksubset’ received from the BS.

Antenna ports—have a size of 2 to 5 bits

Table 25 below shows an example of the bandwidth part indicator includedin the DCI format 0_1.

TABLE 25 Value of BWP indicator field 2 bits Bandwidth part 00Configured BWP with BWP-Id = 1 01 Configured BWP with BWP-Id = 2 10Configured BWP with BWP-Id = 3 11 Configured BWP with BWP-Id = 4

Table 26 below shows an example of a codebook subset configuration forcodebook based uplink transmission of the UE. In particular, Table 26below relates to a case where the UE uses four antenna ports for theuplink transmission, is configured with the higher layer parameter‘maxRank’ having a value of 2, 3, or 4 from the BS, and is configuredwith ‘transform precoder’ which is the higher layer parameter configuredto disabled. In this case, a value of the precoding and number of layersfield included in the DCI format 0_1 may be mapped to one of the indexesin Table 26 below based on the value of ‘codebookSubset’ which is thehigher layer parameter configured from the BS by the UE.

TABLE 26 Bit Bit Bit field field field mapped mapped mapped tocodebookSubset = to codebookSubset = to codebookSubset = indexfullyAndPartialAndNonCoherent index partialAndNonCoherent indexnonCoherent  0 1 layer: TPMI = 0  0 1 layer: TPMI = 0 0 1 layer: TPMI =0  1 1 layer: TPMI = 1  1 1 layer: TPMI = 1 1 1 layer: TPMI = 1 — — — —— —  3 1 layer: TPMI = 3  3 1 layer: TPMI = 3 3 1 layer: TPMI = 3  4 2layers: TPMI = 0  4 2 layers: TPMI = 0 4 2 layers: TPMI = 0 — — — — — — 9 2 layers: TPMI = 5  9 2 layers: TPMI = 5 9 2 layers: TPMI = 5 10 3layers: TPMI = 0 10 3 layers: TPMI = 0 10  3 layers: TPMI = 0 11 4layers: TPMI = 0 11 4 layers: TPMI = 0 11  4 layers: TPMI = 0 12 1layer: TPMI = 4 12 1 layer: TPMI = 4 12-15 reserved — — — — 19 1 layer:TPMI = 11 19 1 layer: TPMI = 11 20 2 layers: TPMI = 6 20 2 layers: TPMI= 6 — — — — 27 2 layers: TPMI = 13 27 2 layers: TPMI = 13 28 3 layers:TPMI = 1 28 3 layers: TPMI = 1 29 3 layers: TPMI = 2 29 3 layers: TPMI =2 30 4 layers: TPMI = 1 30 4 layers: TPMI = 1 31 4 layers: TPMI = 2 31 4layers: TPMI = 2 32 1 layers: TPMI = 12 — — 47 1 layers: TPMI = 27 48 2layers: TPMI = 14 — — 55 2 layers: TPMI = 21 56 3 layers: TPMI = 3 — —59 3 layers: TPMI = 6 60 4 layers: TPMI = 3 61 4 layers: TPMI = 4 62-63reserved

Table 27 below shows an example of a codebook subset configuration forcodebook based uplink transmission of the UE. In particular, Table 27below relates to a case where the UE uses four antenna ports for theuplink transmission, is configured with the higher layer parameter‘maxRank’ having the value of 1 from the BS, and is configured with‘transform precoder’ which is the higher layer parameter configured toenabled or disabled. In this case, a value of the precoding and numberof layers field included in the DCI format 0_1 may be mapped to one ofthe indexes in Table 27 below based on the value of ‘codebookSubset’which is the higher layer parameter configured from the BS by the UE.

TABLE 27 Bit Bit Bit field field field mapped mapped mapped tocodebookSubset = to codebookSubset = to codebookSubset = indexfullyAndPartialAndNonCoherent index partialAndNonCoherent indexnonCoherent 0 1 layer: TPMI = 0 0 1 layer: TPMI = 0 0 1 layer: TPMI = 01 1 layer: TPMI = 1 1 1 layer: TPMI = 1 1 1 layer: TPMI = 1 — — — — — —3 1 layer: TPMI = 3 3 1 layer: TPMI = 3 3 1 layer: TPMI = 3 4 1 layer:TPMI = 4 4 1 layer: TPMI = 4 — — — — 11  1 layer: TPMI = 11 11  1 layer:TPMI = 11 12  1 layers: TPMI = 12 12-15 reserved — — 27  1 layers: TPMI= 27 28-31 reserved

Table 28 below shows an example of a codebook subset configuration forcodebook based uplink transmission of the UE. In particular, Table 28below relates to a case where the UE uses two antenna ports for theuplink transmission and is configured with the higher layer parameter‘maxRank’ having the value of 2 from the BS. In this case, a value ofthe precoding and number of layers field included in the DCI format 0_1may be mapped to one of the indexes in Table 28 below based on the valueof ‘codebookSubset’ which is the higher layer parameter configured fromthe BS by the UE.

TABLE 28 Bit Bit field field mapped mapped to codebookSubset = tocodebookSubset = index fullyAndPartialAndNonCoherent index noncoherent 01 layer: TPMI = 0 0 1 layer: TPMI = 0 1 1 layer: TPMI = 1 1 1 layer:TPMI = 1 2 2 layers: TPMI = 0 2 2 layers: TPMI = 0 3 1 layer: TPMI = 2 3reserved 4 1 layer: TPMI = 3 5 1 layer: TPMI = 4 6 1 layer: TPMI = 5 7 2layers: TPMI = 1 8 2 layers: TPMI = 2 9-15 reserved

Table 29 below shows an example of a codebook subset configuration forcodebook based uplink transmission of the UE. In particular, Table 29below relates to a case where the UE uses two antenna ports for theuplink transmission, is configured with the higher layer parameter‘maxRank’ having the value of 1 from the BS, and is configured with‘transform precoder’ which is the higher layer parameter configured todisabled. In this case, a value of the precoding and number of layersfield included in the DCI format 0_1 may be mapped to one of the indexesin Table 29 below based on the value of ‘codebookSubset’ which is thehigher layer parameter configured from the BS by the UE.

TABLE 29 Bit Bit field field mapped mapped to codebookSubset = tocodebookSubset = index fullyAndPartialAndNonCoherent index noncoherent 01 layer: TPMI = 0 0 1 layer: TPMI = 0 1 1 layer: TPMI = 1 1 1 layer:TPMI = 1 2 1 layer: TPMI = 2 3 1 layer: TPMI = 3 4 1 layer: TPMI = 4 5 1layer: TPMI = 5 6-7 reserved

Uplink Power Control

In the wireless communication system, transmission power of the terminal(e.g., user equipment (UE) and/or a mobile device may be required toincrease or decrease according to a situation. As such, controlling thetransmission power of the UE and/or the mobile device may be referred toas uplink power control. As an example, a transmission power controlscheme may be applied to satisfy a requirement (e.g., Signal-to-NoiseRatio (SNR), Bit Error Ratio (BER), Block Error Ratio (BLER), etc.) in aBS (e.g., gNB, eNB, etc.).

The power control described above may be performed by an open-loop powercontrol scheme and a closed-loop power control scheme.

Specifically, the open-loop power control scheme means a scheme ofcontrolling the transmission power without a feedback from atransmitting device (e.g., the BS, etc.) to a receiving device (e.g.,UE, etc.) and/or a feedback from the receiving device to thetransmitting device. As an example, the UE may receive a specificchannel/signal (pilot channel/signal) from the BS and estimate astrength of reception power by using the received pilot channel/signal.Thereafter, the UE may control the transmission power by using theestimated strength of the reception power.

In contrast, the closed-loop power control scheme means a scheme ofcontrolling the transmission power based on the feedback from thetransmitting device to the receiving device and/or the feedback from thereceiving device to the transmitting device. As an example, the BSreceives the specific channel/signal (pilot channel/signal) from the UEand determines an optimum power level of the UE based on a power level,SNR, BER, BLER, etc., measured by the received specific channel signal(pilot channel/signal). The BS may transfer information (i.e., feedback)on the determined optimum power level to the UE through a controlchannel and the corresponding UE may control the transmission power byusing the feedback provided by the BS.

Hereinafter, a power control scheme for cases where the UE and/or themobile device performs uplink transmission to the BS in the wirelesscommunication system will be described in detail.

Specifically, hereinafter, power control schemes for uplink data channel(e.g., Physical Uplink Shared Channel (PUSCH)) transmission will bedescribed. In this case, a transmission occasion (i.e., transmissiontime unit) (i) for PUSCH may be defined by slot index n_s in a frame ofa system frame number (SFN), a first symbol S in the slot, the number Lof consecutive symbols, etc.

Power Control of Uplink Data Channel

Hereinafter, for convenience of description, the power control schemewill be described based on the case where the UE performs PUSCHtransmission. The corresponding scheme may be extensively applied toanother uplink data channel supported in the wireless communicationsystem, of course.

In PUSCH transmission in an active uplink UL bandwidth part (UL BWP) ofcarrier f of serving cell c, the UE may calculate a liner power value ofthe transmission power determined by Equation 9 below. Thereafter, thecorresponding UE may control the transmission power by considering thecalculated linear power value, the number of antenna ports, and/or thenumber of SRS ports. The UE may scale a linear value with a ratio of thenumber of antenna ports having non-zero PUSCH transmission power to themaximum SRS port number supported in one SRS resource by the UE. The UEequally splits the power across the antenna port in which the UEtransmits the PUSCH with non-zero power.

Specifically, when the UE performs PUSCH transmission in activated ULBWP(b) of carrier f of serving cell c by using a parameter setconfiguration based on index j and a PUSCH power control adjustmentstate based on index l, the UE may determine PUSCH transmission powerPUSCH P_(PUSCH,b,f,c)(i,j,q_(d),l) (dBm) in a PUSCH transmissionopportunity i based on Equation 9 below.

$\begin{matrix}{{P_{{P{USCH}},b,f,c}( {i,j,q_{d},l} )} = {\min \begin{Bmatrix}{{P_{{CMAX},f,c}(i)},} \\{P_{{O\_ PUSCH},b,f,c} + {10\; {\log_{10}( {2^{\mu} \cdot {M_{{RB},b,f,c}^{PUSCH}(i)}} )}} + {{\alpha_{b,f,c}(j)} \cdot {{PL}_{b,f,c}( q_{d} )}} + {\Delta_{{TF},b,f,c}(i)} + {f_{b,f,c}( {i,l} )}}\end{Bmatrix}}} & \lbrack {{Equation}\mspace{14mu} 9} \rbrack\end{matrix}$

[dBm]

In Equation 9, index j may represent an index for an open loop powercontrol parameter (e.g., Po, alpha (α), etc.) and a maximum of 32parameter sets per cell may be configured. Index q_d may represent anindex of a DL RS resource for PathLoss (PL) measurement (e.g.,PL_(b,f,c)(q_(d))) and a maximum of four measurement values per cell maybe configured. Index l may represent an index for a closed loop powercontrol process and a maximum of two processes per cell may beconfigured.

Specifically, Po (e.g., P_(O_PUSCH,b,f,c)(j)) as a parameter broadcastedto some of system information may represent a target reception power ata receiving side. The corresponding Po value may be configured byconsidering a throughput of the UE, a capacity of the cell, noise,and/or interference. Further, alpha (e.g., α_(b,f,c)(j)) may represent aratio of performing compensation for pathloss. The alpha may beconfigured to a value of 0 to 1 and full pathloss compensation orfractional pathloss compensation may be performed according to theconfigured value. In this case, the alpha value may be configured byconsidering the interference between the UEs and/or a data speed.Further, P_(CMAX f,c) (i) may represent a configured UE transmit power.As an example, the configured UE transmit power may be construed as a‘configured maximum UE output power’ defined in 3GPP TS 38.101-1 and/orTS38.101-2. Further, M_(RBb,f,c) ^(PUSCH)(i) may represent a bandwidthof PUSCH resource assignment expressed as the number of resource blocks(RBs) for a PUSCH transmission opportunity based on a subcarrier spacingμ. Further, f_(b,f,c)(i,l) related to the PUSCH power control adjustmentstate may be configured or indicated based on a TPC command field of DCI(e.g., DCI format 0_0, DCI format 0_1, DCI format 2_2, DCI format 2_3,etc.).

In this case, a specific Radio Resource Control (RRC) parameter (e.g.,SRI-PUSCHPowerControl-Mapping, etc.) may represent a linkage between theSRS Resource Indicator (SRI) field of downlink control information (DCI)and the indexes j, q_d, and l. In other words, the indexes j, l, and q_dmay be associated with a beam, a panel, and/or a spatial domaintransmission filter based on specific information. Therefore, PUSCHtransmission power control in units of beam, panel, and/or spatialdomain transmission filter may be performed.

Parameters and/or information for the PUSCH power control may beindividually (i.e., independently) configured for each BWP. In thiscase, the parameters and/or information may be configured or indicatedthrough a higher layer signaling (e.g., RRC signaling, Medium AccessControl-Control Element (MAC-CE), etc.) and/or DCI. As an example, theparameter and/or information for the PUSCH power control may betransferred through RRC signaling PUSCH-ConfigCommon,PUSCH-PowerControl, etc., and PUSCH-ConfigCommon and PUSCH-PowerControlmay be configured as shown in Table 30 below.

TABLE 30 PUSCH-ConfigCommon ::=   SEQUENCE { groupHoppingEnabledTransformPrecoding    ENUMERATED {enabled} pusch-TimeDomainAllocationList PUSCH- TimeDomainResourceAllocationList msg3-DeltaPreamble    INTEGER (−1..6)  p0-NominalWithGrant    INTEGER(−202..24)  ... } PUSCH-PowerControl ::= SEQUENCE {  tpc-Accumulation ENUMERATED { disabled }  msg3-Alpha   Alpha  p0-NominalWithoutGrant INTEGER (−202..24)  p0-AlphaSets    SEQUENCE (SIZE (1..maxNrofP0-PUSCH-AlphaSets)) OF P0-PUSCH-AlphaSet  pathlossReferenceRSToAddModListSEQUENCE  (SIZE (1..maxNrofPUSCH-PathlossReferenceRSs)) OFPUSCH-PathlossReferenceRS  pathlossReferenceRSToReleaseList SEQUENCE(SIZE (1..maxNrofPUSCH- PathlossReferenceRSs)) OFPUSCH-PathlossReferenceRS-Id  twoPUSCH-PC-AdjustmentStates  ENUMERATED{twoStates}  deltaMCS   ENUMERATED {enabled} sri-PUSCH-MappingToAddModList   SEQUENCE (SIZE (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControl sri-PUSCH-MappingToReleaseList  SEQUENCE (SIZE (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControlId }

The UE may determine or calculate the PUSCH transmission power throughthe scheme and transmit the PUSCH by using the determined or calculatedPUSCH transmission power.

Hereinafter, the method for transmitting the uplink signal based on thecodebook will be described in detail.

In the present disclosure, the UE may be classified into three typesbased on a capability related to transmission power which the UE may useduring the uplink transmission. The classifying scheme based on thecapability related to the uplink transmission power of the UE will bedescribed in more detail with reference to FIG. 21.

FIG. 21 is a diagram illustrating an example for a configuration schemeof a Tx chain of a UE.

More specifically, FIG. 21 relates to a configuration scheme of the Txchain of the UE of power class 3 (23 dBm).

FIG. 21(a-1) illustrates an example of power class 3 UE using fourantenna ports for the uplink transmission and FIG. 21(a-2) illustratesan example of power class 3 UE using two antenna ports for the uplinktransmission. As illustrated in FIGS. 21(a-1) and 21(a-2), a case whereall antenna ports which the UE uses for the uplink transmission mayachieve the transmission power of 23 dBm is defined as UE capability 1.Here, the antenna ports may be mapped to an antenna element by Txvirtualization, but will be collectively referred to as the antenna portfor convenience of description. The UE capability 1 may be expressed asa first capability, a first capability type, etc., and may be variouslyexpressed in a range which is interpreted to be the same or similarthereas, of course.

Further, FIG. 21(b-1) illustrates an example of power class 3 UE usingfour antenna ports for the uplink transmission and FIG. 21(b-2)illustrates an example of power class 3 UE using two antenna ports forthe uplink transmission. As illustrated in FIGS. 21(b-1) and (b-2), acase where 23 dBm may not be achieved with one specific antenna portamong the antenna ports which the UE uses for the uplink transmission,i.e., a case where any antenna port may not achieve 23 dBm is defined asUE capability 2. The UE capability 2 may be expressed as a secondcapability, a second capability type, etc., and may be variouslyexpressed in a range which is interpreted to be the same or similarthereas, of course.

Further, FIG. 21(c-1) illustrates an example of power class 3 UE usingfour antenna ports for the uplink transmission and FIG. 21(c-2)illustrates an example of power class 3 UE using two antenna ports forthe uplink transmission. As illustrated in FIGS. 21(c-1) and (c-2), acase where only one specific antenna port among the antenna ports whichthe UE uses for the uplink transmission may achieve 23 dBm is defined asUE capability 3. The UE capability 3 may be construed as a combinationof UE capability 1 and UE capability 2. The UE capability 3 may beexpressed as a third capability, a third capability type, etc., and maybe variously expressed in a range which is interpreted to be the same orsimilar thereas, of course.

The following schemes may be supported for full power transmission forthe UE of UE capability 2 and the UE of UE capability 3.

-   -   The UE may be configured with one mode of two modes of a full        power operation supporting UE capability 2 and UE capability 3        according to the UE capability.    -   The UE may be configured by the network so as to support the        full power transmission.    -   Mode 1: The UE may be configured with one or more SRS resources        of the same number as the number of SRS ports in an SRS resource        set in which a higher layer parameter ‘usage’ is configured to        ‘codebook’.

In the Mode 1, the BS (gNB) may be configured to use a subset of atransmit precoding matrix indicator combining ports in a layer so as forthe UE to perform the full power transmission for the UE.

Further, in the Mode 1, a new codebook subset may be used for a rankvalue in which the full power transmission in the uplink is notachieved. In this case, the new codebook may include a TPMI included inthe codebook subset used when the higher layer parameter‘codebookSubset’ is configured to ‘fullyAndPartialAndNonCoherent’.

Further, in the Mode 1, a non-antenna selection TPMI precoder may be atleast supported.

Further, in the Mode 1, an antenna selection TPMI precoder may beadditionally supported.

-   -   Mode 2: The UE may be configured with one or more SRS resources        of a different number from the number of SRS ports in the SRS        resource set in which the higher layer parameter ‘usage’ is        configured to ‘codebook’.

In the Mode 2, the UE may transmit the SRS and the PUSCH by the samescheme.

Further, in the Mode 2, the codebooks in Tables 18 to 24 and thecodebook subsets in Tables 26 to 29 may be used. Here, the antennaselection precoder may be used in order to enable a full power relatedpower amplifier (PA) so as to perform the full power transmission for UEcapability 3.

Further, in the Mode 2, the uplink full power transmission may beachieved for PUSCH transmission according to the indicated SRI and/orTPMI. Here, a set of TPMIs transferring the full power may be signaledfor SRS resources of one or more ports by the UE in order to at leastsupport UE capability 3. For example, when the SRI indicating SRSs ofmultiple ports is transmitted based on an MIMO operation of Rel-15, 1layer PUSCH may be transmitted with the full power in the same scheme asin a single port SRS for the SRI indicating the SRS resource of oneport.

Further, with respect to 4 Tx on a UE side (20+20+17+17 dBm) virtualizedby 2 SRS port, a case where the full power transmission is enabled by aprecoder [0 1] or [1 0] is not included.

Further, two or three SRS resources may be supported. In addition, withrespect to 4 Tx, one or more other TPMIs/TPMI groups may support thefull power.

For full power UL transmission of the UE, two modes may besupported/configured. The two modes may be mode 1 and mode 2. In thecase of mode 1, the full power uplink transmission is achieved bymodifying an uplink codebook subset configurable according to a coherenttransmission capability of the UE in Tables 26 to 29. The coherenttransmission capability may mean a capability in which the UE constantlymaintains a difference between phase values applied to the antenna portsof the UE for the uplink transmission between the antenna ports. Thecoherent transmission capability may be expressed as a phase differencemaintaining capability, a phase coherernce maintaining capability, aphase maintaining capability, etc., and variously expressed in a rangeinterpreted to be the same or similar thereas, of course.

The UE may be classified into three types based on a phase valuedifference maintaining capability between the antenna ports (Tx ports).

First, a UE which may constantly maintain the difference between thephase values applied to the antenna port for all antenna port pairs maybe defined as a ‘full coherent UE’. A capability of constantlymaintaining the difference between the phase values applied to theantenna port for all antenna port pairs may be defined as ‘fullcoherent’. The difference of the phase value may mean a difference on afrequency/time axis.

Second, a UE that may maintain the difference between the phase valuesapplied to the antenna port only for some antenna port pairs and/or someantenna ports among all antenna port pairs may be defined as a ‘partialcoherent UE’. A capability of maintaining the difference between thephase values applied to the antenna port only for some antenna portpairs among all antenna port pairs may be defined as ‘partial coherent’.The difference of the phase value may mean the difference on thefrequency/time axis.

Last, a UE which may not maintain the difference between the phasevalues applied to the antenna port for all antenna port pairs may bedefined as a ‘non coherent UE’. That is, in the case of the ‘noncoherent UE’, the difference between the phase values applied to theantenna ports for transmission of the uplink signal may be changed inall antenna port pairs. A capability which may not maintain thedifference between the phase values applied to the antenna port for allantenna port pairs may be defined as ‘non coherent’. The difference ofthe phase value may mean the difference on the frequency/time axis.

In the case of the non coherent UE, the UE may be limited to use only aport selection codebook for the uplink signal transmission based on thecodebook. Table 31 below shows an example of the codebook for the uplinktransmission for rank 1 using two antenna ports.

When the UE is the non-coherent UE and is limited to use only the portselection codebook, the UE may use only a precoding matrix in which theTPMI index is 0 and 1 among precoding matrices included in the codebookof Table 31 below for the uplink transmission. That is, the codebook forthe uplink transmission for rank 1 using two antenna ports includes onlythe precoding matrix in which the TPMI index is 0 and 1.

In this case, in the case of the UE of UE capability 2, since the UEtransmits the uplink signal based on power transmittable through onlyone antenna port, the UE may use only a transmission power of 20 dBm.Accordingly, the UE may not use transmission power of a full powertransmission (23 dBm) value for transmitting the uplink signal.

That is, only one antenna port is selected for the uplink signaltransmission of the UE based on the precoding matrix in which the TPMIindex is 0 and 1. Accordingly, the UE transmits the uplink signal byusing only one antenna port and in the example of (b-2) of FIG. 21,since one antenna port may use only the transmission power of 20 dBm,the UE consequently transmits the uplink signal by using only thetransmission power of 20 dBm through only one antenna port.

TABLE 31 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-5 $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\0\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}0 \\1\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\1\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\{- 1}\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\j\end{bmatrix}$ $\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\{- j}\end{bmatrix}$

The present disclosure proposes methods for solving a problem that theUE may not perform the uplink transmission based on the full powertransmission. More specifically, the present disclosure proposescodebook subset configuring methods capable of facilitating theoperation in mode 1 of the UE and increasing uplink transmissionperformance of the UE.

Hereinafter, a codebook subset configuring method (Proposals 1 and 1-1)for the full power transmission of the non-coherent UE and a codebooksubset configuring method (Proposals 2, 2-1, 2-2, and 2-3) for the fullpower transmission of the partial-coherent UE will be described.

Codebook Subset Configuring Method for Full Power Transmission ofNon-Coherent UE

(Proposal 1) In the case of the non-coherent UE, the codebook subset forthe full power uplink transmission is configured/applied.

The codebook subset may be a codebook subset used by Rel-16 Mode 1,non-coherent UE.

More specifically, based on the difference between the phase valuesapplied to the antenna ports for the transmission of the uplink signalis not maintained in all antenna port pairs and/or antenna ports, thecodebook subset for the uplink signal transmission of the UE may includespecific precoding matrices for full power uplink transmission. Thespecific precoding matrices may be precoding matrices not included inthe codebook subset of the case of ‘codebookSubset=nonCoherent’ ofTables 28 to 29. The UE as the non-coherent UE may perform the fullpower uplink transmission based on the specific precoding matrices. Inthis case, the UE may perform the uplink transmission using all antennaports among the antenna ports for the uplink signal transmission. Morespecifically, the UE may receive information for determining thetransmission power value for the uplink transmission from the BS anddetermine the uplink transmission power based on the information. Inthis case, the determined uplink transmission power is divided into asame value and applied across all of the antenna ports for thetransmission of the uplink signal. Hereinafter, when the UE performs thefull power transmission based on the codebook subset proposed in thepresent disclosure, the above-described contents may be similarlyapplied.

Hereinafter, for convenience of description, the precoding matrix may beexpressed as TPMI, precoder, codeword, etc.

Table 32 below shows an example of a codebook subset for a case wherethe UE as the non-coherent UE uses two antenna ports for the uplinktransmission and the value of ‘maxRank’ is 2.

TABLE 32 Rel-15, Rel-16 Mode 1, Non-coherent UE Non-coherent UE Rank 1TPMI 0-1 0-2 index Rank 2 TPMI 0 0 index

In Table 32 above, the codebook subset for the case of ‘Rel-15,Non-coherent UE’ and the codebook subset for the case of ‘Rel-16 Mode 1,Non-coherent UE’ may be configured based on the codebook of Table 18 andthe codebook of Table 21.

The codebook subset for the case of ‘Rel-15, Non-coherent UE’ isconfigured to be the same as the codebook subset of a case of‘codebookSubset=nonCoherent’ in Table 28. On the contrary, the codebooksubset for the case of ‘Rel-16 Mode 1, Non-coherent UE’ may furtherinclude a precoding matrix in which the TPMI index is 2 among theprecoding matrices included in the codebook of Table 18 for rank 1.

Table 33 below shows an example of a codebook subset for a case wherethe UE as the non-coherent UE uses four antenna ports for the uplinktransmission and the value of ‘maxRank’ is 4.

TABLE 33 Rel-15, Rel-16 Mode 1, Non-coherent UE Non-coherent UE Rank 1TPMI 0-3 0-3, 12 index Rank 2 TPMI 0-5 0-6 index Rank 3 TPMI 0 0-1 indexRank 4 TPMI 0 0 index

In Table 33 above, the codebook subset for the case of ‘Rel-15,Non-coherent UE’ and the codebook subset for the case of ‘Rel-16 Mode 1,Non-coherent UE’ may be configured based on at least one codebook of i)one of the codebook of Table 19 or the codebook of Table 20, ii) thecodebook of Table 22, iii) the codebook of Table 23, or iv) the codebookof Table 24. When there is no separate description, for the UE thattransmits the uplink signal by using four antenna ports, the method forconfiguring the codebook subset for the case of ‘Rel-15, Non-coherentUE’ and the codebook subset for the case of ‘Rel-16 Mode 1, Non-coherentUE’ is the same as the above-described method.

According to Table 33 above, the codebook subset for the case of‘Rel-15, Non-coherent UE’ may be configured to be the same as thecodebook subset of the case of ‘codebookSubset=nonCoherent’ in Tables 26and 27.

On the contrary, the codebook subset for the case of ‘Rel-16 Mode 1,Non-coherent UE’ may further include a precoding matrix in which theTPMI index is 12 among the precoding matrices included in one codebookof the codebook of Table 19 or 20 for rank 1, further include aprecoding matrix in which the TPMI index is 6 among the precodingmatrices included in the codebook of Table 22 for rank 2, and furtherinclude a precoding matrix in which the TPMI index is 1 among theprecoding matrices included in the codebook of Table 23 for rank 3.

The examples of Tables 32 and 33 above are just examples and the methodproposed in the present disclosure is not limited thereto.

In the case of the non-coherent UE, since the UE does not have acapability of maintaining a relative phase difference between theantenna ports, there may be no difference in uplink transmissionperformance even though the full coherent UE selects any TPMI among theTPMIs used for the uplink transmission. That is, regardless of whichprecoding matrix among the precoding matrices which the full coherent UEuses for the uplink transmission is included in the codebook subset forthe uplink transmission of the non-coherent UE, the uplink transmissionperformance of the UE may be the same. More specifically, when the UEperforms the uplink transmission for rank 1 by using two antenna ports,the uplink transmission performance may be the same even though the UEuses any TPMI among TPMIs 2 to 5 used by the full coherent UE.

Accordingly, a principle of the proposal 1 is to add, with respect to aspecific rank in which the full power uplink transmission is notsupported, one specific TPMI supporting the full power transmissionincluded in the codebook for the specific rank, to the codebook subsetfor the specific rank. In particular, the proposal 1 may be morepreferably applied to the case of the UE of UE capability 2.

As another example of Table 32 above, TPMI 3, 4, or 5 may be added, notTPMI 2 of rank 1 added to the codebook subset.

Further, as another example of Table 33, one specific TPMI among TPMIs13 to 27 other than TPMI 12 of rank 1 is added to the codebook subset,one specific TPMI among TPMIs 7 to 21 other than TPMI 6 of rank 2 isadded to the codebook subset, and one specific TPMI among TPMIs 2 to 6other than TPMI 1 of rank 3 is added to the codebook subset to configurea new codebook subset.

In particular, in the case of rank 3, referring to Table 23, thetransmission power is uneven between layers in TPMI 1. Specifically,since the power of layer 0 is P/2 and the powers of layers 1 and 2 areP/4 (here, P represents the transmission power), the uplink transmissionperformance of the UE may deteriorate depending on the channel status.

Referring to the codebook for rank 3 of Table 23, it can be seen thatthe same transmission power is applied in TPMI 3. Accordingly, in orderto solve a problem that a different transmission power is applied foreach layer in the uplink transmission of rank 3, a codebook subsetincluding both TPMI 1 and TPMI 3 included in the codebook of rank 3 forrank 3 may be configured. Alternatively, a codebook subset includingonly TPMI 3 may be configured.

Additionally, when the transmission rank of the UE is limited based onan RRC parameter ‘maxRank’ indicator, the codebook subset may beconfigured by using even a rank indicated by ‘maxRank’ in Tables 32 and33 above. More specifically, when the UE transmitting the uplink signalby using four antenna ports is configured with a ‘maxRank’ indicatorindicating a maximum transmission rank as 2, the codebook subset may beconfigured as in Table 34 below.

TABLE 34 Rel-15, Rel-16 Mode 1, Non-coherent UE Non-coherent UE Rank 1TPMI 0-3 0-3, 12 index Rank 2 TPMI 0-5 0-6 index

As such, the configured codebook subset may include at least oneprecoding matrix for each rank according to the value of the maximumtransmission rank configured based on the maxRank value. In this case,the precoding matrices for each rank may be expressed as a precodingmatrix set. In summary, it may be appreciated that the codebook subsetis configured in a structure including the precoding matrix set for eachrank based on the value of the maximum transmission rank configuredbased on the maxRank value. The above-described contents may besimilarly applied even to the codebook subsets configured based onmethods described below.

(Proposal 1-1) Codebook subset based on that maxRank is limited to inuplink transmission of UE in case of non-coherent UE

When the UE transmitting the uplink signal by using four antenna portsis configured with the ‘maxRank’ indicator indicating the maximumtransmission rank as 1, the codebook subset may be configured as inTable 35 below.

TABLE 35 Rel-15, Rel-16, Mode 1, Non-coherent UE Non-coherent UE Rank 1TPMI 0-3 0-3, 12-15 index

When in the case of the UE transmitting the uplink signal by using fourantenna ports, the maximum transmission rank is limited to 1 (maxRank=1)or in the case of DFT-s-OFDM (transfer precoding enabled), the UE as theRel-15, non-coherent UE may be indicated with the TPMI for the uplinktransmission based on DCI including a TPMI field having a 2-bit size.That is, the UE as the Rel-15, non-coherent UE may be indicated with theTPMI only by four states (0, 1, 2, and 3).

On the contrary, in the case of the UE as the Rel-16, Mode 1,Non-coherent UE, since a new TPMI is added to the codebook subset forthe full power uplink transmission, the size of the TPMI field of theDCI becomes 3 bits (0, 1, 2, 3, and 12). In this case, the proposalproposes a scheme of making maximum use of three remaining states. Thatis, in Proposal 1, only a single state (TPMI 12) is added and theremaining states are “reserved”, but in Proposal 1-1, a scheme ofutilizing all of four states (TPMIs 12 to 15) is proposed.

Codebook Subset Configuring Method for Full Power Transmission ofPartial-Coherent UE

(Proposal 2) In the case of the partial-coherent UE, the codebook subsetfor the full power uplink transmission is configured/applied.

The codebook subset may be a codebook subset used by the UE as theRel-16 Mode 1, partial-coherent UE.

Table 36 below shows an example of a codebook subset for a case wherethe UE as the partial-coherent UE uses four antenna ports for the uplinksignal transmission and the value of ‘maxRank’ is 4.

TABLE 36 Rel-15, Rel-16, Mode 1, Partial-coherent UE Partial-coherent UERank 1 TPMI 0-11 0-15 index Rank 2 TPMI 0-13 0-13 index Rank 3 TPMI 0-2 0-2  index Rank 4 TPMI 0-2  0-2  index

In Table 36 above, the codebook subset for the case of ‘Rel-15,partial-coherent UE’ and the codebook subset for the case of ‘Rel-16Mode 1, partial-coherent UE’ may be configured based on at least onecodebook of i) one of the codebook of Table 19 or the codebook of Table20, ii) the codebook of Table 22, iii) the codebook of Table 23, or iv)the codebook of Table 24. When there is no separate description, for theUE as the partial-coherent UE that transmits the uplink signal by usingfour antenna ports, the method for configuring the codebook subset forthe case of ‘Rel-15, Partial-coherent UE’ and the codebook subset forthe case of ‘Rel-16 Mode 1, Partial-coherent UE’ is the same as theabove-described method.

According to Table 36 above, the codebook subset for the case of‘Rel-15, Partial-coherent UE’ may be configured to be the same as thecodebook subset of the case of ‘codebookSubset=partialAndNonCoherent’ inTables 26 and 27.

On the contrary, the codebook subset for the case of ‘Rel-16 Mode 1,Partial-coherent UE’ may further include a precoding matrix in which theTPMI index is 12 to 15 among the precoding matrices included in onecodebook of the codebook of Table 19 or 20 for rank 1 unlike the case of‘Rel-15, Partial-coherent UE’.

The example of Table 36 above is just an example and the method proposedin the present disclosure is not limited thereto.

In the case of the Partial-coherent UE, the UE partially has acapability of maintaining the relative phase difference between theantenna ports. That is, the phase difference is maintained only for someantenna ports among all antenna ports of the UE.

More specifically, each of antenna ports 0 and 2 (antenna port pair)and/or antenna ports 1 and 3 may have the capability of maintaining therelative phase difference. Accordingly, in the proposal, it is proposedthat the codebook subset includes a specific TPMI group including arelative phase change between the antenna ports. For example, one offour groups of TPMIs 12 to 15/16 to 19/20 to 23/24 to 27 in the codebookof rank 1 may be included in the codebook subset.

In other words, in the proposal, based on that a difference betweenphase values applied to antenna ports for the transmission of the uplinksignal of the UE is maintained in some antenna ports and/or antenna portpairs among all antenna port pairs, the codebook subset may include atleast one specific precoding matrix applying different phase values toantenna ports included in all or some of the some antenna ports and/orantenna port pairs.

The at least one specific precoding matrix may be precoding matrices notincluded in the codebook subset of the case of‘codebookSubset=partialAndNonCoherent’ of Tables 26 and 27.

Table 36 above corresponds to an embodiment in which a specific TPMIgroup includes TPMIs 12 to 15.

As another example, the specific TPMI group may be configured to includeTPMIs 12, 17, 22, and 27. As such, based on constituting the specificTPMI group, the difference of the phase value applied to antenna portsrespectively included in antenna port pairs ((i) antenna ports 0 and 2and (ii) antenna ports 1 and 3) may be diversified.

${\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\{- 1}\end{bmatrix}},$

More specifically, referring to Table 19, since TPMI 12 is there is nodifference in phase between antenna ports 0 and 2 and there is a phasedifference of 180

${\frac{1}{2}\begin{bmatrix}1 \\j \\j \\1\end{bmatrix}},$

degrees between antenna ports 1 and 3. Further, since TPMI 17 is thereis a phase difference of approximately 90 degrees between antenna ports0 and 2 and there is a phase difference of approximately 90 degreesbetween antenna ports 1 and 3. Further, since TPMI

${\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\{- 1}\end{bmatrix}},$

22 is there is a phase difference of approximately 180 degrees betweenantenna ports 0 and 2 and there is no phase difference between antennaports 1 and 3. Last, since TPMI

${\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- j} \\1\end{bmatrix}},$

27 is there is a phase difference of approximately 270 degrees betweenantenna ports 0 and 2 and there is a phase difference of approximately270 degrees between antenna ports 1 and 3. That is, in the case of TPMIs11 to 15, the phase difference between the antenna ports respectivelyincluded in some antenna port pairs having the phase differencemaintaining capability may be equally applied, while when the TPMIsincluded in the codebook subset is configured as such, the phasedifference between the antenna ports included in the antenna portsrespectively included in the antenna port pairs may be differentlyapplied.

Since the codebook subset for the case of ‘Rel-15, Partial-coherent UE’already supports the full power transmission for ranks 2 to 4, theprecoding matrices for ranks 2 to 4 included in the codebook subset maybe equally configured in the case of ‘Rel-15, Partial-coherent UE’ andthe case of ‘Rel-16, Mode 1, Partial-coherent UE’.

(Proposal 2-1) Codebook Subset Based on that maxRank is Configured to 4in Uplink transmission of UE in case of Partial-coherent UE

When the UE as Rel-16, Mode 1, Partial-coherent UE transmits the uplinksignal by using four antenna ports and maxRank is configured to 4, thecodebook subset may be configured as in Table 37 for the full poweruplink transmission.

TABLE 37 Rel-15, Rel-16, Mode 1, Partial-coherent UE Partial -coherentUE Rank 1 TPMI 0-11 4-15 index Rank 2 TPMI 0-13 0-13 index Rank 3 TPMI0-2  0-2  index Rank 4 TPMI 0-2  0-2  index

When in the case of the UE transmitting the uplink signal by using fourantenna ports, the maximum transmission rank is configured to 4(maxRank=4) the UE as Rel-15, Partial-coherent UE may be indicated withthe TPMI for the uplink transmission based on DCI including a TPMI fieldhaving a 5-bit size. That is, since a value acquired by adding all ofTPMI state 12 for rank 1, TPMI state 14 for rank 2, TPMI state 3 forrank 3, and TPMI state 3 for rank 3 is 12+14+3+3=32, the UE may beindicated with the TPMI based on the DCI including the TPMI field havingthe 5-bit size.

On the contrary, referring to Table 36 above, since a value acquired byadding all of TPMI state 16 (TPMIs 12 to 15 are added) for rank 1, TPMIstate 14 for rank 2, TPMI state 3 for rank 3, and TPMI state 3 for rank3 is 16+14+3+3=36, the UE requires the DCI including the TPMI fieldhaving a 6-bit size in order to be indicated with the TPMI and the TRI.In this case, since only 36 states among 64 (2{circumflex over ( )}6)states are used, 28 states are reserved, and as a result, there may be aproblem that the waste of the state is deepened.

In order to solve the problem the state waste, in the proposal, proposedis a method in which when the UE is configured with maxRank=4, only theTPMIs for rank 1 included in the subset include one (e.g., TPMIs 12 to15) of the groups in which the full power transmission is available isincluded except for non-coherent codewords (TPMIs 0 to 3).

Additionally, in the proposal, an example of a codebook subsetconfiguration for a case where the maximum transmission rank of the UEtransmitting the uplink signal by using four antenna ports is limited tomaxRank=1 is shown in Table 38 below.

More specifically, when the maximum transmission rank of the UE islimited to maxRank=1, the codebook subset includes a TPMI which is thesame as the TPMI which the UE as Rel-15, Partial-coherent UE uses forrank 1 transmission and may be configured to further include one (e.g.,TPMIs 12 to 15) of the groups of the TPMI for rank 1 in which the fullpower transmission is available. That is, the TPMIs for rank 1 includedin the codebook subset may be a TPMI in which the TPMI index is 1 to 15among the TPMIs included in the codebook for rank 1 transmission usingfour antenna ports.

TABLE 38 Rel-15, Rel-16, Mode 1, Partial-Coherent UE Partial -coherentUE Rank 1 TPMI 0-11 0-15 index

The principle may be equally applied even to the case of DFT-s-OFDM.

According to the proposal 2-1, the configuration of the precoding matrixset (TPMIs) for rank 1 included in the codebook subset may varyaccording to maxRank indicated through an RRC signaling. Through such acodebook subset configuration scheme, availability of a payload of theDCI used for indicating the TPMI and/or TRI may be maximized.

(Proposal 2-2) TPMI Reduction for Ranks 3 and 4 in Case ofPartial-Coherent UE

When the UE as the ‘Rel-16 Mode 1, Partial-coherent UE’ transmits theuplink signal by using four antenna ports and the maximum transmissionrank is configured as maxRank=4, the codebook subset may be configuredas in Table 39 for the full power uplink transmission.

TABLE 39 Rel-15, Rel-16, Mode 1, Partial -coherent UE Partial -coherentUE Rank 1 TPMI 0-11 0-15 index Rank 2 TPMI 0-13 0-13 index Rank 3 TPMI0-2  1 index Rank 4 TPMI 0-2  0 index

According to Table 39 above, the codebook subset for the case of‘Rel-15, Partial-coherent UE’ may be configured to be the same as thecodebook subset of the case of ‘codebookSubset=partialAndNonCoherent’ inTables 26 and 27.

On the contrary, the codebook subset for the case of ‘Rel-16 Mode 1,Partial-coherent UE’ may further include a precoding matrix in which theTPMI index is 12 to 15 among the precoding matrices included in onecodebook of the codebook of Table 19 or 20 for rank 1 unlike the case of‘Rel-15, Partial-coherent UE’. Further, the codebook subset may includeonly TPMI 1 for rank 3 and include only TPMI 0 for rank 4 unlike thecase of ‘Rel-15, Partial-coherent UE’.

The proposal is a proposal that reduces the codebook subset for a higherrank (e.g., ranks 3 and 4) and adds TPMI(s) (e.g., TPMIs 12 to 15) forthe full power uplink transmission of rank 1. That is, the proposalrelates to a method for excluding two TPMIs from the codebook subset ineach of ranks 3 and 4 and adding four TPMIs to the codebook subset forrank 1.

In the case of the higher rank, an increase gain of throughput which maybe obtained by configuring a codebook size largely is not large.Accordingly, a TPMI for achieving full power is added to rank 1 insteadof not configuring the size of the codebook largely, and as a result,there is an effect that a gain by achieving the full power transmissionmay be further increased.

(Proposal 2-3) In the case of Partial-coherent UE, for the full poweruplink transmission, in Tables 26 to 29, the codebook subset for thecase of ‘codebookSubset=PartialAndNonCoherent’ may be used as it is.

The above-described proposed methods (Proposal 1/Proposal 1-1/Proposal2/Proposal 2-1/Proposal 2-2/Proposal 2-3) are just classified forconvenience of description and do not limit the range of the technicalspirit of the methods proposed in the present disclosure. For example,the above-described proposed method is individually applied orconfigured by a combination of one or more proposed methods to be usedfor codebook based uplink transmission.

FIG. 22 is a flowchart showing an example an operation implemented in aUE for performing a method in which the UE transmits an uplink signalbased on a codebook in a wireless communication system proposed in thepresent disclosure.

More specifically, in a wireless communication system, in order for a UEto perform a method for transmitting an uplink signal based on acodebook, the UE receives, from a BS, downlink control information (DCI)for determining a precoding matrix applied to the transmission of theuplink signal (S2210).

Here, the codebook may include a first codebook for rank 1 using fourantenna ports for the transmission of the uplink signal, the codebooksubset may be configured based on precoding matrices included in thefirst codebook, and each of the precoding matrices included in the firstcodebook may be indexed by a transmit precoding matrix indicator (TPMI)index.

Further, the first codebook may be determined by one of the followingtables.

TABLE 40 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\\begin{matrix}0 \\j\end{matrix}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- 1} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- j} \\{- j}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- 1} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- j} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\j \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- j} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\1 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\j \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- 1} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- j} \\1\end{bmatrix}$ — — — —

TABLE 41 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- 1} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- j} \\{- j}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- 1} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- j} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\1 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\j \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- j} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\1 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\j \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- 1} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- j} \\{- 1}\end{bmatrix}$ — — — —

Here, the TPMI index may be indexed according to ascending order from aleft side to a right side of the table with respect to the precodingmatrices included in the first codebook.

Next, the UE determines the precoding matrix applied to the transmissionof the uplink signal from a codebook subset related to the transmissionof the uplink signal based on the DCI (S2220).

Further, the codebook may further include (i) a second codebook for rank2 using four antenna ports for transmitting the uplink signal, (ii) athird codebook for rank 3 using four antenna ports for transmitting theuplink signal, and (iii) a fourth codebook for rank 4 using four antennaports for transmitting the uplink signal, and the codebook subset may beconfigured further based on the precoding matrices respectively includedin the second to fourth codebooks.

In this case, the third codebook may be determined by the followingtable, and

TABLE 42 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\0 & 0 & 1 \\0 & 0 & 0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\1 & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\{- 1} & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\1 & 1 & {- 1} \\1 & {- 1} & {- 1}\end{bmatrix}$ 4-6 $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\j & j & {- j} \\j & {- j} & {- j}\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\1 & 1 & {- 1} \\{- 1} & 1 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\j & j & {- j} \\{- j} & j & j\end{bmatrix}$ —

the fourth codebook may be determined by the following table.

TABLE 43 W TPMI index (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 & 0 \\0 & 1 & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\1 & {- 1} & 0 & 0 \\0 & 0 & 1 & {- 1}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\j & {- j} & 0 & 0 \\0 & 0 & j & {- j}\end{bmatrix}$ $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\1 & 1 & {- 1} & {- 1} \\1 & {- 1} & {- 1} & 1\end{bmatrix}$ 4 $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\j & j & {- j} & {- j} \\j & {- j} & {- j} & j\end{bmatrix}$ — — —

Here, the TPMI index may be indexed according to ascending order from aleft side to a right side of the table with respect to the precodingmatrices respectively included in the third codebook and the fourthcodebook.

Further, the codebook subset may further include (i) a precoding matrixin which the TPMI index is 1 among the precoding matrices included inthe third codebook and (ii) a precoding matrix in which the TPMI indexis 0 among the precoding matrices included in the fourth codebook.

Last, the UE transmits, to the BS, the uplink signal based on thedetermined precoding matrix (S2230). Here, based on that a differencebetween phase values applied to antenna ports for the transmission ofthe uplink signal is maintained in some antenna ports among all antennaport pairs, the codebook subset includes at least one specific precodingmatrix applying different phase values to antenna ports included in allor some of the some antenna ports.

In this case, the at least one specific precoding matrix may be aprecoding matrix in which the TPMI index is 12 to 15 among the precodingmatrices included in the first codebook.

Further, the at least one specific precoding matrix may be a precodingmatrix in which the TPMI index is 12, 17, 22, and 27 among the precodingmatrices included in the first codebook.

Further, the codebook subset may further include at least one precodingmatrix for selecting some antenna ports among the antenna ports fortransmitting the uplink signal.

Further, based on that the determined precoding matrix is one precodingmatrix among the at least one specific precoding matrix, the uplinksignal may be transmitted based on full power transmission through allof the antenna ports for transmitting the uplink signal.

Additionally, the UE may determine an uplink transmission power for theuplink transmission based on the DCI. In this case, the DCI may furtherinclude information on an optimal power level for the uplinktransmission, and the determined uplink transmission power may bedivided into a same value and applied across all of the antenna portsfor the transmission of the uplink signal.

Additionally, configuration information for a maximum rank value for thetransmission of the uplink signal may be received from the BS. Here, aconfiguration of the precoding matrices included in the codebook subsetmay vary based on the maximum rank value. Here, based on that themaximum rank value is 4, the codebook subset may include precodingmatrices in which the TPMI index is 4 to 15 among the precoding matricesincluded in the first codebook. Further, based on that the maximum rankvalue is 1, the codebook subset may include precoding matrices in whichthe TPMI index is 1 to 15 among the precoding matrices included in thefirst codebook.

Further, a UE transmitting an uplink signal based on a codebook in awireless communication system includes a transmitter for transmitting aradio signal, a receiver for receiving the radio signal, and a processorfunctionally connected to the transmitter and the receiver. In thiscase, the processor may control the transmitter and the receiver so asto perform the operations described in FIG. 22 above.

FIG. 23 is a flowchart showing an example an operation implemented in aBS for performing a method in which a UE transmits an uplink signalbased on a codebook in a wireless communication system proposed in thepresent disclosure. More specifically, in a wireless communicationsystem, in order for a BS to perform a method for receiving an uplinksignal based on a codebook, the BS transmits, to a UE, downlink controlinformation

(DCI) for determining a precoding matrix applied to transmission of theuplink signal (S2310).

Next, the BS receives, from the UE, the uplink signal based on theprecoding matrix determined based on the DCI (S2320). In this case,based on that a difference between phase values applied to antenna portsfor the transmission of the uplink signal is maintained in some antennaports among all antenna port pairs in the UE, the codebook subsetincludes at least one specific precoding matrix applying different phasevalues to antenna ports included in all or some of the some antennaports.

Further, a BS receiving an uplink signal based on a codebook in awireless communication system includes a transmitter for transmitting aradio signal, a receiver for receiving the radio signal, and a processorfunctionally connected to the transmitter and the receiver. In thiscase, the processor may control the transmitter and the receiver so asto perform the operations described in FIG. 23 above.

Additionally, the apparatus performing the operation described in FIG.22 above may be controlled by the processor. More specifically, in anapparatus including one or more memories and one or more processorsfunctionally connected to the one or more memories, the one or moreprocessors control the apparatus to receive downlink control information(DCI) for determining a precoding matrix applied to transmission of theuplink signal from the BS.

Next, the processors control the apparatus to determine the precodingmatrix applied to the transmission of the uplink signal from a codebooksubset related to the transmission of the uplink signal based on theDCI.

Next, the processors control the apparatus to transmit the uplink signalto the BS based on the determined precoding matrix, and based on that adifference between phase values applied to antenna ports for thetransmission of the uplink signal is maintained in some antenna portsamong all antenna port pairs in the UE, the codebook subset includes atleast one specific precoding matrix applying different phase values toantenna ports included in all or some of the some antenna ports.

Further, the processors may control the apparatus so that the apparatusperforms the operation described in FIG. 23.

Further, the operation described in FIG. 22 above may be executed by anon-transitory computer readable medium (CRM) storing one or moreinstructions. More specifically, one or more instructions executable byone or more processors allow a UE to receive, from a BS, downlinkcontrol information (DCI) for determining a precoding matrix applied totransmission of an uplink signal.

Next, the instructions allow the UE to determine the precoding matrixapplied to the transmission of the uplink signal from a codebook subsetrelated to the transmission of the uplink signal based on the DCI.

Next, the instructions allow the UE to transmit, to the BS, the uplinksignal based on the determined precoding matrix. In this case, based onthat a difference between phase values applied to antenna ports for thetransmission of the uplink signal is maintained in some antenna portsamong all antenna port pairs, the codebook subset includes at least onespecific precoding matrix applying different phase values to antennaports included in all or some of the some antenna ports.

Further, the instructions may include one or more instructions thatallow the operations described in FIG. 23 above to be performed.

Signal transmission/reception procedure example applied to presentdisclosure

FIG. 24 is a diagram illustrating an example of an uplink transmissionsignaling procedure to which methods proposed in the present disclosuremay be applied.

An example of signaling between the BS and the UE for theabove-described proposed method (Proposal 1/Proposal 1-1/Proposal2/Proposal 2-1/Proposal 2-2/Proposal 2-3) may be illustrated in FIG. 24.FIG. 24 is just for convenience of the description and does not limitthe scope of the present disclosure.

Further, some of steps described in FIG. 24 may be merged or omitted. Inperforming procedures described below, the above-described CSI relatedoperation may be considered/applied. The operations of the BS and the UEin FIG. 24 may be based on the above-described uplinktransmission/reception operations.

BS Operation

A base station (BS) may receive UE capability information from a userequipment (UE) (S105). For example, the UE capability information mayinclude # of supported antenna port/coherency capability (e.g.,nonCoherent, partialNonCoherent, fullCoherent)/full power transmissioncapability. When the UE capability information is predefined/promised,the corresponding step may be omitted.

For example, an operation of the BS (e.g., reference numeral 100200 ofFIG. 26) in step S105 described above, which receives the UE capabilityinformation from the UE (reference numeral 100/200 of FIGS. 26 to 29)may be implemented by the devices of FIGS. 26 to 29 to be describedbelow. For example, referring to FIG. 26, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 toreceive the UE capability information, and one or more transceivers 106may receive the UE capability information from the UE.

The BS may transmit, to the UE, system information (SI) and/orscheduling information and/or CSI related Configuration and/orPUSCH-Config through a higher layer (e.g., RRC or MAC CE). As anexample, the information transmitted through the higher layer may beindividually/independently transmitted.

For example, an operation of the BS (reference numeral 100/200 of FIG.26) in step S110 described above, which transmits, to the UE (referencenumeral 100/200 of FIGS. 26 to 29), system information (SI) and/orscheduling information and/or CSI related Config and/or PUSCH Config maybe implemented by devices of FIGS. 26 to 29 to be described below. Forexample, referring to FIG. 26, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 to transmitthe system information (SI) and/or scheduling information and/or CSIrelated Config, and one or more transceivers 106 may transmit, to theUE, the system information (SI) and/or scheduling information and/or CSIrelated Config and/or PUSCH Config.

The BS may transmit, to the corresponding UE, RS (e.g., SSB, CSI-RS,TRS, PT-RS, etc.) in order to acquire information on a channel status(i.e., DL CSI acquisition) (S115). As an example, the corresponding stepmay be based on a CSI related operation.

For example, an operation of the BS (e.g., reference numeral 100/200 ofFIG. 26) in step S115 described above, which transmits the DL CSIacquisition related RS to the UE (reference numeral 100/200 of FIGS. 26to 29) may be implemented by devices of FIGS. 26 to 29 to be describedbelow. For example, referring to FIG. 26, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 totransmit the DL CSI acquisition related RS and one or more transceivers106 may transmit the DL CSI acquisition related RS to the UE.

The BS may receive, from the corresponding UE, RS (e.g., SRS, etc.) inorder to acquire information on a channel status (i.e., UL CSIacquisition). As an example, the corresponding step may be based on theabove-described CSI related operation. As an example, the RS may bebased on channel information calculated based on the DL CSI acquisitionrelated RS in step S115 above. Further, the BS may receive the channelinformation together with the RS.

For example, an operation of the BS (e.g., reference numeral 100/200 ofFIG. 26) in step S120 described above, which receives the UL CSIacquisition related RS from the UE (reference numeral 100/200 of FIGS.26 to 29) may be implemented by devices of FIGS. 26 to 29 to bedescribed below. For example, referring to FIG. 26, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 to receive the UL CSI acquisition related RS and oneor more transceivers 106 may receive the UL CSI acquisition related RSfrom the UE.

The BS may transmit, to the UE, UL scheduling information/precodingrelated information (S125). As an example, the precoding relatedinformation may include information on SRI/TPMI/TRI/MCS. As an example,the UL scheduling information/precoding related information may be DCIformat 0-1 or DCI format 0-0. For example, the UL schedulinginformation/precoding related information may bedetermined/configured/indicated based on the above-described proposedmethod (e.g., Proposal 1/Proposal 1-1/Proposal 2/Proposal 2-1/Proposal2-2/Proposal 2-3). As an example, when the UE is a Non-coherent UE, acodebook subset to be applied to/used for UL transmission of thecorresponding UE may be configured/determined/indicated based on

Proposal 1/Proposal 1-1 described above. As an example, when the UE is aPartial-coherent UE, the codebook subset to be applied to/used for ULtransmission of the corresponding UE may beconfigured/determined/indicated based on Proposal 2/Proposal2-1/Proposal 2-2/Proposal 2-3 described above.

For example, an operation of the BS (100/200 of FIG. 26) in step S125described above, which transmits, to the UE (100/200 of FIGS. 26 to 29),the UL scheduling information/precoding related information may beimplemented by the devices of FIGS. 26 to 29 to be described below. Forexample, referring to FIG. 26, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 to transmitthe UL scheduling information/precoding related information and one ormore transceivers 106 may transmit the UL schedulinginformation/precoding related information to the UE.

The BS may receive, from the UE, a UL channel/signal transmitted basedon the UL scheduling information/precoding related information (S130).As an example, the BS may receive, from the UE, data to which theprecoding is applied and RS (e.g., DMRS) for data decoding. For example,the transmission of the UL channel/signal may be based on theabove-described method (e.g., Proposal 1/Proposal 1-1/Proposal2/Proposal 2-1/Proposal 2-2/Proposal 2-3). As an example, thetransmission of the UL channel/signal may correspond to full power ULtransmission which is based on the above-described method (e.g.,Proposal 1/Proposal 1-1/Proposal 2/Proposal 2-1/Proposal 2-2/Proposal2-3).

For example, an operation of the BS (e.g., reference numeral 100/200 ofFIG. 26) in step S130 described above, which receives, from the UE(reference numeral 100/200 of FIGS. 26 to 29), the UL channel/signal maybe implemented by the devices of FIGS. 26 to 29 to be described below.For example, referring to FIG. 26, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 toreceive the UL channel/signal, and one or more transceivers 106 mayreceive the UL channel/signal from the UE.

UE Operation

A user equipment (UE) may transmit UE capability information to a basestation (BS) (S105). For example, the UE capability information mayinclude # of supported antenna port/coherency capability (e.g.,nonCoherent, partialNonCoherent, fullCoherent)/full power transmissioncapability. When the UE capability information is predefined/promised,the corresponding step may be omitted.

For example, an operation of the UE (e.g., reference numeral 100/200 ofFIGS. 26 to 29) in step S105 described above, which transmits the UEcapability information to the BS (reference numeral 100/200 of FIG. 26)may be implemented by the devices of FIGS. 26 to 29 to be describedbelow. For example, referring to FIG. 26, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 totransmit the UE capability information, and one or more transceivers 106may transmit the UE capability information from the UE.

The UE may receive, from the BS, system information (SI) and/orscheduling information and/or CSI related Configuration (theabove-described CSI reporting setting/CSI-RS resource setting) and/orPUSCH-Config through a higher layer (e.g., RRC or MAC CE) (S110). As anexample, the information transmitted through the higher layer may beindividually/independently transmitted.

For example, an operation of the UE (100/200 of FIGS. 26 to 29) in stepS110 described above, receives, from the BS (100/200 of FIG. 26), thesystem information (SI) and/or scheduling information and/or CSI relatedConfig may be implemented by the devices of FIGS. 26 to 29 to bedescribed below. For example, referring to FIG. 26, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 to transmit the system information (SI) and/orscheduling information and/or CSI related

Config and/or PUSCH Config, and one or more transceivers 106 mayreceive, from the BS, the system information (SI) and/or schedulinginformation and/or CSI related Config and/or PUSCH Config.

The UE may receive, from the BS, RS (e.g., SSB, CSI-RS, TRS, PT-RS,etc.) transmitted for acquiring information on a downlink channel status(i.e., DL CSI acquisition) (S115). As an example, the corresponding stepmay be based on the above-described CSI related operation.

For example, an operation of the UE (e.g., reference numeral 100/200 ofFIGS. 26 to 29) in step S115 described above, which receives the DL CSIacquisition related RS from the BS (reference numeral 100/200 of FIG.26) may be implemented by the devices of FIGS. 26 to 29 to be describedbelow. For example, referring to FIG. 26, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 toreceive the DL CSI acquisition related RS and one or more transceivers106 may receive the DL CSI acquisition related RS to the UE.

The UE may transmit, to the BS, RS (e.g., SRS, etc.) in order to acquireinformation on an uplink channel status (i.e., UL CSI acquisition). Asan example, the corresponding step may be based on a CSI relatedoperation. As an example, the RS may be based on channel informationcalculated based on the DL CSI acquisition related RS in step S115above. Further, the UE may transmit the channel information togetherwith the RS.

For example, an operation of the UE (e.g., reference numeral 100/200 ofFIGS. 26 to 29) in step S210 described above, which transmits the UL CSIacquisition related RS to the BS (reference numeral 100/200 of FIG. 26)may be implemented by the devices of FIGS. 26 to 29 to be describedbelow. For example, referring to FIG. 26, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 totransmit the UL CSI acquisition related RS and one or more transceivers106 may transmit the UL CSI acquisition related RS from the UE.

The UE may receive, from the BS, UL scheduling information/precodingrelated information (S125). As an example, the precoding relatedinformation may include information on SRI/TPMI/TRI/MCS. As an example,the UL scheduling information/precoding related information may be DCIformat 0-1 or DCI format 0-0. For example, the UL schedulinginformation/precoding related information may bedetermined/configured/indicated based on the above-described proposedmethod (e.g., Proposal 1/Proposal 1-1/Proposal 2/Proposal 2-1/Proposal2-2/Proposal 2-3). As an example, when the UE is a Non-coherent UE, acodebook subset to be applied to/used for UL transmission of thecorresponding UE may be configured/determined/indicated based onProposal 1/Proposal 1-1 described above. As an example, when the UE is aPartial-coherent UE, the codebook subset to be applied to/used for ULtransmission of the corresponding UE may beconfigured/determined/indicated based on Proposal 2/Proposal2-1/Proposal 2-2/Proposal 2-3 described above.

For example, an operation of the UE (100/200 of FIGS. 26 to 29) in stepS125 described above, which receives, from the BS (100/200 of FIG. 26),the UL scheduling information/precoding related information may beimplemented by the devices of FIGS. 26 to 29 to be described below. Forexample, referring to FIG. 26, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 to receivethe UL scheduling information/precoding related information and one ormore transceivers 106 may receive the UL schedulinginformation/precoding related information to the UE.

The UE may transmit, to the BS, a UL channel/signal transmitted based onthe UL scheduling information/precoding related information (S130). Asan example, the UE may transmit, to the BS, data to which the precodingis applied and RS (e.g., DMRS) for data decoding. For example, thetransmission of the UL channel/signal may be based on theabove-described method (e.g., Proposal 1/Proposal 1-1/Proposal2/Proposal 2-1/Proposal 2-2/Proposal 2-3). As an example, thetransmission of the UL channel/signal may correspond to full power ULtransmission which is based on the above-described method (e.g.,Proposal 1/Proposal 1-1/Proposal 2/Proposal 2-1/Proposal 2-2/Proposal2-3).

For example, an operation of the UE (e.g., reference numeral 100/200 ofFIGS. 26 to 29) in step S130 described above, which transmits, to the BS(reference numeral 100/200 of FIG. 26), the UL channel/signal may beimplemented by the devices of FIGS. 26 to 29 to be described below. Forexample, referring to FIG. 26, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 to receivethe UL channel/signal, and one or more transceivers 106 may transmit theUL channel/signal from the UE.

As mentioned above, the above-described BS/UE operation (e.g., Proposal1/Proposal 1-1/Proposal 2/Proposal 2-1/Proposal 2-2/Proposal 2-3/FIG.24) may be implemented by the devices (FIGS. 26 to 29) to be describedbelow. For example, the UE may correspond to a first wireless device andthe BS may correspond to a second wireless device and in some cases, anopposite case thereto may also be considered.

For example, the above-described BS/UE operation (e.g., Proposal1/Proposal 1-1/Proposal 2/Proposal 2-1/Proposal 2-2/Proposal 2-3/FIG.24) may be processed by one or more processors (e.g., 102 and 202) ofFIGS. 26 to 29 and the BS/UE operation (e.g., Proposal 1/Proposal1-1/Proposal 2/Proposal 2-1/Proposal 2-2/Proposal 2-3/FIG. 24) may bestored in a memory (e.g., one or more memories (e.g., 104 and 204) ofFIG. 26) in the form of an instruction/program (e.g., instruction andexecutable code) for driving at least one processor (e.g., 102 and 202)of FIGS. 26 to 29.

Example of Communication System to which Present Disclosure is Applied

Although not limited thereto, but various descriptions, functions,procedures, proposals, methods, and/or operation flowcharts of thepresent disclosure, which are disclosed in this document may be appliedto various fields requiring wireless communications/connections (e.g.,5G) between devices.

Hereinafter, the communication system will be described in more detailwith reference to drawings. In the following drawings/descriptions, thesame reference numerals will refer to the same or corresponding hardwareblocks, software blocks, or functional blocks if not differentlydescribed.

FIG. 25 illustrates a communication system applied to the presentdisclosure.

Referring to FIG. 25, a communication system 1 applied to the presentdisclosure includes a wireless device, a BS, and a network. Here, thewireless device may mean a device that performs communication by using awireless access technology (e.g., 5G New RAT (NR) or Long Term Evolution(LTE)) and may be referred to as a communication/wireless/5G device.Although not limited thereto, the wireless device may include a robot100 a. vehicles 100 b-1 and 100 b-2, an eXtended Reality (XR) device 100c, a hand-held device 100 d, a home appliance 100 e, an Internet ofThing (IoT) device 100 f, and an AI device/server 400. For example, thevehicle may include a vehicle with a wireless communication function, anautonomous driving vehicle, a vehicle capable of performinginter-vehicle communication, and the like. Here, the vehicle may includean Unmanned Aerial Vehicle (UAV) (e.g., drone). The XR device mayinclude an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented as a form such as a head-mounteddevice (HMD), a head-up display (HUD) provided in the vehicle, atelevision, a smart phone, a computer, a wearable device, a homeappliance device, digital signage, a vehicle, a robot, etc. Thehand-held device may include the smart phone, a smart pad, a wearabledevice (e.g., a smart watch, a smart glass), a computer (e.g., anotebook, etc.), and the like. The home appliance device may include aTV, a refrigerator, a washing machine, and the like. The IoT device mayinclude a sensor, a smart meter, and the like. For example, the BS andthe network may be implemented even the wireless device and a specificwireless device 200 a may operate an eNB/network node for anotherwireless device.

The wireless devices 100 a to 100 f may be connected to a network 300through a BS 200. An artificial intelligence (AI) technology may beapplied to the wireless devices 100 a to 100 f and the wireless devices100 a to 100 f may be connected to an AI server 400 through the network300. The network 300 may be configured by using a 3G network, a 4G(e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices100 a to 100 f may communicate with each other through the BS200/network 300, but may directly communicate with each other withoutgoing through the BS/network (sidelink communication). For example, thevehicles 100 b-1 and 100 b-2 may perform direct communication (e.g.,Vehicle to Vehicle (V2V)/Vehicle to everything (V2X) communication).Further, the IoT device (e.g., sensor) may perform direct communicationwith other IoT devices (e.g., sensor) or other wireless devices 100 a to100 f.

Wireless communications/connections 150 a, 150 b, and 150 c may be madebetween the wireless devices 100 a to 100 f and the BS 200 and betweenthe BS 200 and the BS 200. Here, the wireless communication/connectionmay be made through various wireless access technologies (e.g., 5G NR)such as uplink/downlink communication 150 a, sidelink communication 150b (or D2D communication), and inter-BS communication 150 c (e.g., relay,Integrated Access Backhaul (IAB). The wireless device and the BS/thewireless device and the BS and the BS may transmit/receive radio signalsto/from each other through wireless communications/connections 150 a,150 b, and 150 c. For example, the wireless communications/connections150 a, 150 b, and 150 c may transmit/receive signals through variousphysical channels. To this end, based on various proposals of thepresent disclosure, at least some of various configuration informationsetting processes, various signal processing processes (e.g., channelencoding/decoding, modulation/demodulation, resource mapping/demapping,etc.), a resource allocation process, and the like fortransmission/reception of the radio signal may be performed.

Example of Wireless Device to which Present Disclosure is Applied

FIG. 26 illustrates a wireless device which may be applied to thepresent disclosure.

Referring to FIG. 26, a first wireless device 100 and a second wirelessdevice 200 may transmit/receive radio signals through various wirelessaccess technologies (e.g., LTE and NR). Here, the first wireless device100 and the second wireless device 200 may correspond to a wirelessdevice 100 x and a BS 200 and/or a wireless device 100 x and a wirelessdevice 100 x of FIG. 25.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor 102 maycontrol the memory 104 and/or the transceiver 106 and may be configuredto implement descriptions, functions, procedures, proposals, methods,and/or operation flows disclosed in the present disclosure. For example,the processor 102 may process information in the memory 104 and generatea first information/signal and then transmit a radio signal includingthe first information/signal through the transceiver 106. Further, theprocessor 102 may receive a radio signal including a secondinformation/signal through the transceiver 106 and then store in thememory 104 information obtained from signal processing of the secondinformation/signal. The memory 104 may connected to the processor 102and store various information related to an operation of the processor102. For example, the memory 104 may store a software code includinginstructions for performing some or all of processes controlled by theprocessor 102 or performing the descriptions, functions, procedures,proposals, methods, and/or operation flowcharts disclosed in the presentdisclosure. Here, the processor 102 and the memory 104 may be a part ofa communication modem/circuit/chip designated to implement the wirelesscommunication technology (e.g., LTE and NR). The transceiver 106 may beconnected to the processor 102 and may transmit and/or receive the radiosignals through one or more antennas 108. The transceiver 106 mayinclude a transmitter and/or a receiver. The transceiver 106 may be usedmixedly with a radio frequency (RF) unit. In the present disclosure, thewireless device may mean the communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor 202may control the memory 204 and/or the transceiver 206 and may beconfigured to implement descriptions, functions, procedures, proposals,methods, and/or operation flows disclosed in the present disclosure. Forexample, the processor 202 may process information in the memory 204 andgenerate a third information/signal and then transmit a radio signalincluding the third information/signal through the transceiver 206.Further, the processor 202 may receive a radio signal including a fourthinformation/signal through the transceiver 206 and then store in thememory 204 information obtained from signal processing of the fourthinformation/signal. The memory 204 may connected to the processor 202and store various information related to an operation of the processor202. For example, the memory 204 may store a software code includinginstructions for performing some or all of processes controlled by theprocessor 202 or performing the descriptions, functions, procedures,proposals, methods, and/or operation flowcharts disclosed in the presentdisclosure. Here, the processor 202 and the memory 204 may be a part ofa communication modem/circuit/chip designated to implement the wirelesscommunication technology (e.g., LTE and NR). The transceiver 206 may beconnected to the processor 202 and may transmit and/or receive the radiosignals through one or more antennas 208. The transceiver 206 mayinclude a transmitter and/or a receiver and the transceiver 206 may bemixed with the RF unit. In the present disclosure, the wireless devicemay mean the communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described in more detail. Although not limited thereto, one or moreprotocol layers may be implemented by one or more processors 102 and202. For example, one or more processors 102 and 202 may implement oneor more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). One or more processors 102 and 202 may generate one ormore protocol data units (PDUs) and/or one or more service data units(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operation flowcharts disclosed in the presentdisclosure. One or more processors 102 and 202 may generate a message,control information, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operation flowchartsdisclosed in the present disclosure. One or more processors 102 and 202may generate a signal (e.g., a baseband signal) including the PDU, theSDU, the message, the control information, the data, or the informationaccording to the function, the procedure, the proposal, and/or themethod disclosed in the present disclosure and provide the generatedsignal to one or more transceivers 106 and 206. One or more processors102 and 202 may receive the signal (e.g., baseband signal) from one ormore transceivers 106 and 206 and acquire the PDU, the SDU, the message,the control information, the data, or the information according to thedescriptions, functions, procedures, proposals, methods, and/oroperation flowcharts disclosed in the present disclosure.

One or more processors 102 and 202 may be referred to as a controller, amicrocontroller, a microprocessor, or a microcomputer. One or moreprocessors 102 and 202 may be implemented by hardware, firmware,software, or a combination thereof. As one example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in one or moreprocessors 102 and 202. The descriptions, functions, procedures,proposals, and/or operation flowcharts disclosed in the presentdisclosure may be implemented by using firmware or software and thefirmware or software may be implemented to include modules, procedures,functions, and the like. Firmware or software configured to perform thedescriptions, functions, procedures, proposals, and/or operationflowcharts disclosed in the present disclosure may be included in one ormore processors 102 and 202 or stored in one or more memories 104 and204 and driven by one or more processors 102 and 202. The descriptions,functions, procedures, proposals, and/or operation flowcharts disclosedin the present disclosure may be implemented by using firmware orsoftware in the form of a code, the instruction and/or a set form of theinstruction.

One or more memories 104 and 204 may be connected to one or moreprocessors 102 and 202 and may store various types of data, signals,messages, information, programs, codes, instructions, and/or commands.One or more memories 104 and 204 may be configured by a ROM, a RAM, anEPROM, a flash memory, a hard drive, a register, a cache memory, acomputer reading storage medium, and/or a combination thereof. One ormore memories 104 and 204 may be positioned inside and/or outside one ormore processors 102 and 202. Further, one or more memories 104 and 204may be connected to one or more processors 102 and 202 through varioustechnologies such as wired or wireless connection.

One or more transceivers 106 and 206 may transmit to one or more otherdevices user data, control information, a wireless signal/channel, etc.,mentioned in the methods and/or operation flowcharts of the presentdisclosure. One or more transceivers 106 and 206 may receive from one ormore other devices user data, control information, a wirelesssignal/channel, etc., mentioned in the descriptions, functions,procedures, proposals, methods, and/or operation flowcharts disclosed inthe present disclosure. For example, one or more transceivers 106 and206 may be connected to one or more processors 102 and 202 and transmitand receive the radio signals. For example, one or more processors 102and 202 may control one or more transceivers 106 and 206 to transmit theuser data, the control information, or the radio signal to one or moreother devices. Further, one or more processors 102 and 202 may controlone or more transceivers 106 and 206 to receive the user data, thecontrol information, or the radio signal from one or more other devices.Further, one or more transceivers 106 and 206 may be connected to one ormore antennas 108 and 208 and one or more transceivers 106 and 206 maybe configured to transmit and receive the user data, controlinformation, wireless signal/channel, etc., mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperation flowcharts disclosed in the present disclosure through one ormore antennas 108 and 208. In the present disclosure one or moreantennas may be a plurality of physical antennas or a plurality oflogical antennas (e.g., antenna ports). One or more transceivers 106 and206 may convert the received radio signal/channel from an RF band signalto a baseband signal in order to process the received user data, controlinformation, radio signal/channel, etc., by using one or more processors102 and 202. One or more transceivers 106 and 206 may convert the userdata, control information, radio signal/channel, etc., processed byusing one or more processors 102 and 202, from the baseband signal intothe RF band signal. To this end, one or more transceivers 106 and 206may include an (analog) oscillator and/or filter.

Example of Signal Processing Circuit to which Present Disclosure isApplied

FIG. 27 illustrates a signal processing circuit for a transmit signal.

Referring to FIG. 27 a signal processing circuit 1000 may include ascrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040,a resource mapper 1050, and a signal generator 1060. Although notlimited thereto, an operation/function of FIG. 27 may be performed bythe processors 102 and 202 and/or the transceivers 106 and 206 of FIG.26. Hardware elements of FIG. 27 may be implemented in the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 26. For example,blocks 1010 to 1060 may be implemented in the processors 102 and 202 ofFIG. 26. Further, blocks 1010 to 1050 may be implemented in theprocessors 102 and 202 of FIG. 26 and the block 1060 may be implementedin the transceivers 106 and 206 of FIG. 26.

A codeword may be transformed into a radio signal via the signalprocessing circuit 1000 of FIG. 27. Here, the codeword is an encoded bitsequence of an information block. The information block may includetransport blocks (e.g., a UL-SCH transport block and a DL-SCH transportblock). The radio signal may be transmitted through various physicalchannels (e.g., PUSCH and PDSCH).

Specifically, the codeword may be transformed into a bit sequencescrambled by the scrambler 1010. A scramble sequence used for scramblingmay be generated based on an initialization value and the initializationvalue may include ID information of a wireless device. The scrambled bitsequence may be modulated into a modulated symbol sequence by themodulator 1020. A modulation scheme may include pi/2-Binary Phase ShiftKeying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature AmplitudeModulation (m-QAM), etc. A complex modulated symbol sequence may bemapped to one or more transport layers by the layer mapper 1030.Modulated symbols of each transport layer may be mapped to acorresponding antenna port(s) by the precoder 1040 (precoding). Output zof the precoder 1040 may be obtained by multiplying output y of thelayer mapper 1030 by precoding matrix W of N*M. Here, N represents thenumber of antenna ports and M represents the number of transport layers.Here, the precoder 1040 may perform precoding after performing transformprecoding (e.g., DFT transform) for complex modulated symbols. Further,the precoder 1040 may perform the precoding without performing thetransform precoding.

The resource mapper 1050 may map the modulated symbols of each antennaport to a time-frequency resource. The time-frequency resource mayinclude a plurality of symbols (e.g., CP-OFDMA symbol and DFT-s-OFDMAsymbol) in a time domain and include a plurality of subcarriers in afrequency domain. The signal generator 1060 may generate the radiosignal from the mapped modulated symbols and the generated radio signalmay be transmitted to another device through each antenna. To this end,the signal generator 1060 may include an Inverse Fast Fourier Transform(IFFT) module, a Cyclic Prefix (CP) insertor, a Digital-to-AnalogConverter (DAC), a frequency uplink converter, and the like.

A signal processing process for a receive signal in the wireless devicemay be configured in the reverse of the signal processing process (1010to 1060) of FIG. 27. For example, the wireless device (e.g., 100 or 200of FIG. 26) may receive the radio signal from the outside through theantenna port/transceiver. The received radio signal may be transformedinto a baseband signal through a signal reconstructer. To this end, thesignal reconstructer may include a frequency downlink converter, ananalog-to-digital converter

(ADC), a CP remover, and a Fast Fourier Transform (FFT) module.Thereafter, the baseband signal may be reconstructed into the codewordthrough a resource de-mapper process, a postcoding process, ademodulation process, and a de-scrambling process. The codeword may bereconstructed into an original information block via decoding.Accordingly, a signal processing circuit (not illustrated) for thereceive signal may include a signal reconstructer, a resource demapper,a postcoder, a demodulator, a descrambler, and a decoder.

Utilization Example of Wireless Device to which Present Disclosure isApplied

FIG. 28 illustrates another example of a wireless device applied to thepresent disclosure. The wireless device may be implemented as varioustypes according to a use example/service (see FIG. 25).

Referring to FIG. 28, wireless devices 100 and 200 may correspond to thewireless devices 100 and 200 of FIG. 26 and may be constituted byvarious elements, components, units, and/or modules. For example, thewireless devices 100 and 200 may include a communication unit 110, acontrol unit 120, and a memory unit 130, and an additional element 140.The communication unit may include a communication circuit 112 and atransceiver(s) 114. For example, the communication circuit 112 mayinclude one or more processors 102 and 202 and/or one or more memories104 and 204 of FIG. 26. For example, the transceiver(s) 114 may includeone or more transceivers 106 and 206 and/or one or more antennas 108 and208 of FIG. 26. The control unit 120 is electrically connected to thecommunication unit 110, the memory unit 130, and the additional element140 and controls an overall operation of the wireless device. Forexample, the control unit 120 may an electrical/mechanical operation ofthe wireless device based on a program/code/instruction/informationstored in the memory unit 130. Further, the control unit 120 maytransmit the information stored in the memory unit 130 to the outside(e.g., other communication devices) through the communication unit 110via a wireless/wired interface or store information received from theoutside (e.g., other communication devices) through the wireless/wiredinterface through the communication unit 110.

The additional element 140 may be variously configured according to thetype of wireless device. For example, the additional element 140 mayinclude at least one of a power unit/battery, an input/output (I/O)unit, a driving unit, and a computing unit. Although not limitedthereto, the wireless device may be implemented as a form such as therobot 100 a of FIG. 25, the vehicles 100 b-1 and 100 b-2 of FIG. 25, theXR device 100 c of FIG. 25, the portable device 100 d of FIG. 25, thehome appliance 100 e of FIG. 25, the IoT device 100 f of FIG. 25, adigital broadcasting terminal, a hologram device, a public safetydevice, an MTC device, a medical device, a fintech device (or financialdevice), a security device, a climate/environment device, an AIserver/device 400 of FIG. 25, the BS 200 of FIG. 25, a network node,etc. The wireless device may be movable or may be used at a fixed placeaccording to a use example/service.

In FIG. 28, all of various elements, components, units, and/or modulesin the wireless devices 100 and 200 may be interconnected through thewired interface or at least may be wirelessly connected through thecommunication unit 110. For example, the control unit 120 and thecommunication 110 in the wireless devices 100 and 200 may be wiredlyconnected and the control unit 120 and the first unit (e.g., 130 or 140)may be wirelessly connected through the communication unit 110. Further,each element, component, unit, and/or module in the wireless devices 100and 200 may further include one or more elements. For example, thecontrol unit 120 may be constituted by one or more processor sets. Forexample, the control unit 120 may be configured a set of a communicationcontrol processor, an application processor, an electronic control unit(ECU), a graphic processing processor, a memory control processor, etc.As another example, the memory 130 may be configured as a random accessmemory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flashmemory, a volatile memory, a non-volatile memory, and/or combinationsthereof.

Hereinafter, an implementation example of FIG. 28 will be described inmore detail with reference to the drawings.

Example of Hand-Held Device to which Present Disclosure is Applied

FIG. 29 illustrates a hand-held device applied to the presentdisclosure. The hand-held device may include a smart phone, a smart pad,a wearable device (e.g., a smart watch, a smart glass), and a hand-heldcomputer (e.g., a notebook, etc.). The hand-held device may be referredto as a Mobile Station (MS), a user terminal (UT), a Mobile SubscriberStation (MSS), a Subscriber Station (SS), an Advanced Mobile Station(AMS), or a Wireless terminal (WT).

Referring to FIG. 29, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an input/outputunit 140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. The blocks 110 to 130/140 a to 140 c correspondto the blocks 110 to 130/140 of FIG. 28, respectively.

The communication unit 110 may transmit/receive a signal (e.g., data, acontrol signal, etc.) to/from another wireless device and BSs. Thecontrol unit 120 may perform various operations by controllingcomponents of the hand-held device 100. The control unit 120 may includean Application Processor (AP). The memory unit 130 may storedata/parameters/programs/codes/instructions required for driving thehand-held device 100. Further, the memory unit 130 may storeinput/output data/information, etc. The power supply unit 140 a maysupply power to the hand-held device 100 and include a wired/wirelesscharging circuit, a battery, and the like. The interface unit 140 b maysupport a connection between the hand-held device 100 and anotherexternal device. The interface unit 140 b may include various ports(e.g., an audio input/output port, a video input/output port) for theconnection with the external device. The input/output unit 140 c mayreceive or output a video information/signal, an audioinformation/signal, data, and/or information input from a user. Theinput/output unit 140 c may include a camera, a microphone, a user inputunit, a display unit 140 d, a speaker, and/or a haptic module.

As an example, in the case of data communication, the input/output unit140 c may acquire information/signal (e.g., touch, text, voice, image,and video) input from the user and the acquired information/signal maybe stored in the memory unit 130. The communication unit 110 maytransform the information/signal stored in the memory into the radiosignal and directly transmit the radio signal to another wireless deviceor transmit the radio signal to the BS. Further, the communication unit110 may receive the radio signal from another wireless device or BS andthen reconstruct the received radio signal into originalinformation/signal. The reconstructed information/signal may be storedin the memory unit 130 and then output in various forms (e.g., text,voice, image, video, or haptic) through the input/output unit 140 c.

Here, wireless communication technology implemented in wireless devices100 and 200 of the present disclosure may include Narrowband Internet ofThings for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 and 200of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called various names including enhancedMachine Type Communication (eMTC), and the like. For example, the LTE-Mtechnology may be implemented as at least any one of various standardssuch as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BandwidthLimited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or7) LTE M. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 and 200 of thepresent disclosure may includes at least one of ZigBee, Bluetooth, andLow Power Wide Area Network (LPWAN) considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)associated with small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be calledvarious names.

It is apparent to those skilled in the art that the present disclosuremay be embodied in other specific forms without departing from essentialcharacteristics of the present disclosure. Accordingly, theaforementioned detailed description should not be construed asrestrictive in all terms and should be exemplarily considered. The scopeof the present disclosure should be determined by rational construing ofthe appended claims and all modifications within an equivalent scope ofthe present disclosure are included in the scope of the presentdisclosure.

The aforementioned embodiments are achieved by combination of structuralelements and features of the present invention in a predeterminedmanner. Each of the structural elements or features should be consideredselectively unless specified separately. Each of the structural elementsor features may be carried out without being combined with otherstructural elements or features. In addition, some structural elementsand/or features may be combined with one another to constitute theembodiments of the present invention. The order of operations describedin the embodiments of the present invention may be changed. Somestructural elements or features of one embodiment may be included inanother embodiment, or may be replaced with corresponding structuralelements or features of another embodiment. Moreover, it is apparentthat some claims referring to specific claims may be combined withanother claims referring to the other claims other than the specificclaims to constitute the embodiment or add new claims by means ofamendment after the application is filed.

The embodiments of the present invention may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present invention may be achieved by one or moreASICs (Application Specific Integrated Circuits), DSPs (Digital SignalProcessors), DSPDs (Digital Signal Processing Devices), PLDs(Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays),processors, controllers, microcontrollers, microprocessors, etc.

In a firmware or software configuration, the embodiments of the presentinvention may be implemented in the form of a module, a procedure, afunction, etc. Software code may be stored in the memory and executed bythe processor. The memory may be located at the interior or exterior ofthe processor and may transmit data to and receive data from theprocessor via various known means.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the inventions. Thus, itis intended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A method for transmitting an uplink signal based on a codebook by aUE in a wireless communication system, the method comprising: receiving,from a base station, downlink control information (DCI) for determininga precoding matrix applied to transmission of the uplink signal;determining the precoding matrix applied to the transmission of theuplink signal from a codebook subset related to the transmission of theuplink signal based on the DCI; and transmitting, to the base station,the uplink signal based on the determined precoding matrix, whereinbased on that a difference between phase values applied to antenna portsfor the transmission of the uplink signal is maintained in some antennaports among all antenna port pairs, the codebook subset includes atleast one specific precoding matrix applying different phase values toantenna ports included in all or some of the some antenna ports.
 2. Themethod of claim 1, wherein the codebook subset further includes at leastone precoding matrix for selecting some antenna ports among the antennaports for transmitting the uplink signal.
 3. The method of claim 2,wherein based on that the determined precoding matrix is one precodingmatrix among the at least one specific precoding matrix, the uplinksignal is transmitted based on full power transmission through all ofthe antenna ports for transmitting the uplink signal.
 4. The method ofclaim 3, further comprising: determining uplink transmission power forthe uplink transmission based on the DCI, wherein the DCI furtherincludes information on an optimal power level for the uplinktransmission, and wherein the determined uplink transmission power isdivided into a same value and applied across all of the antenna portsfor the transmission of the uplink signal.
 5. The method of claim 3,wherein the codebook includes a first codebook for rank 1 using fourantenna ports for transmitting the uplink signal, wherein the codebooksubset is configured based on precoding matrices included in the firstcodebook, and wherein each of the precoding matrices included in thefirst codebook is indexed by a transmit precoding matrix indicator(TPMI) index.
 6. The method of claim 5, wherein the first codebook isdetermined by one of the following tables, and TABLE TPMI index W(ordered from left to right in increasing order of TPMI index) 0-7$\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- 1} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\\begin{matrix}1 \\{- j} \\{- j}\end{matrix}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- 1} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- j} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\j \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- j} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\1 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\j \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- 1} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- j} \\1\end{bmatrix}$ — — — —

TABLE TPMI index W (ordered from left to right in increasing order ofTPMI index) 0-7 $\frac{1}{2}\begin{bmatrix}1 \\0 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\0 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- 1} \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\j \\0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\0 \\{- j} \\0\end{bmatrix}$  8-15 $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}0 \\1 \\0 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\1 \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\j \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- 1} \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\1 \\{- j} \\{- j}\end{bmatrix}$ 16-23 $\frac{1}{2}\begin{bmatrix}1 \\j \\1 \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\j \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- 1} \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\j \\{- j} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\1 \\{- 1}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\j \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- 1} \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- 1} \\{- j} \\j\end{bmatrix}$ 24-27 $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\1 \\{- j}\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\j \\1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- 1} \\j\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 \\{- j} \\{- j} \\{- 1}\end{bmatrix}$ — — — —

wherein the TPMI index is indexed according to ascending order from aleft side to a right side of the table with respect to the precodingmatrices included in the first codebook.
 7. The method of claim 6,wherein the at least one specific precoding matrix is a precoding matrixin which the TPMI index is 12 to 15 among the precoding matricesincluded in the first codebook.
 8. The method of claim 6, wherein the atleast one specific precoding matrix is a precoding matrix in which theTPMI index is 12, 17, 22, and 27 among the precoding matrices includedin the first codebook.
 9. The method of claim 6, further comprising:receiving, from the base station, configuration information for amaximum rank value for the transmission of the uplink signal.
 10. Themethod of claim 9, wherein a configuration of the precoding matricesincluded in the codebook subset varies based on the maximum rank value.11. The method of claim 10, wherein based on that the maximum rank valueis 4, the codebook subset includes precoding matrices in which the TPMIindex is 4 to 15 among the precoding matrices included in the firstcodebook.
 12. The method of claim 10, wherein based on that the maximumrank value is 1, the codebook subset includes precoding matrices inwhich the TPMI index is 1 to 15 among the precoding matrices included inthe first codebook.
 13. The method of claim 7, wherein the codebookfurther includes (i) a second codebook for rank 2 using four antennaports for transmitting the uplink signal, (ii) a third codebook for rank3 using four antenna ports for transmitting the uplink signal, and (iii)a fourth codebook for rank 4 using four antenna ports for transmittingthe uplink signal, and wherein the codebook subset is configured furtherbased on the precoding matrices respectively included in the second tofourth codebooks.
 14. The method of claim 13, wherein the third codebookis determined by the following table, TABLE TPMI index W (ordered fromleft to right in increasing order of TPMI index) 0-3$\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\0 & 0 & 1 \\0 & 0 & 0\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\1 & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 \\0 & 1 & 0 \\{- 1} & 0 & 0 \\0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\1 & 1 & {- 1} \\1 & {- 1} & {- 1}\end{bmatrix}$ 4-6 $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\1 & {- 1} & 1 \\j & j & {- j} \\j & {- j} & {- j}\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\1 & 1 & {- 1} \\{- 1} & 1 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{3}}\begin{bmatrix}1 & 1 & 1 \\{- 1} & 1 & {- 1} \\j & j & {- j} \\{- j} & j & j\end{bmatrix}$ —

wherein the fourth codebook is determined by the following table, andTABLE TPMI index W (ordered from left to right in increasing order ofTPMI index) 0-3 $\frac{1}{2}\begin{bmatrix}1 & 0 & 0 & 0 \\0 & 1 & 0 & 0 \\0 & 0 & 1 & 0 \\0 & 0 & 0 & 1\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\1 & {- 1} & 0 & 0 \\0 & 0 & 1 & {- 1}\end{bmatrix}$ $\frac{1}{2\sqrt{2}}\begin{bmatrix}1 & 1 & 0 & 0 \\0 & 0 & 1 & 1 \\j & {- j} & 0 & 0 \\0 & 0 & j & {- j}\end{bmatrix}$ $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\1 & 1 & {- 1} & {- 1} \\1 & {- 1} & {- 1} & 1\end{bmatrix}$ 4 $\frac{1}{4}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & {- 1} & 1 & {- 1} \\j & j & {- j} & {- j} \\j & {- j} & {- j} & j\end{bmatrix}$ — — —

wherein the TPMI index is indexed according to ascending order from aleft side to a right side of the table with respect to the precodingmatrices respectively included in the third codebook and the fourthcodebook.
 15. The method of claim 14, wherein the codebook subsetfurther includes (i) a precoding matrix in which the TPMI index is 1among the precoding matrices included in the third codebook and (ii) aprecoding matrix in which the TPMI index is 0 among the precodingmatrices included in the fourth codebook.
 16. A UE transmitting anuplink signal based on a codebook in a wireless communication system,the UE comprising: a transmitter for transmitting a radio signal; areceiver for receiving the radio signal; and a processor functionallyconnected to the transmitter and the receiver, wherein the processorcontrols the receiver to receive, from a base station, downlink controlinformation (DCI) for determining a precoding matrix applied totransmission of the uplink signal, controls to determine the precodingmatrix applied to the transmission of the uplink signal from a codebooksubset related to the transmission of the uplink signal based on theDCI, and controls the transmitter to transmit, to the base station, theuplink signal based on the determined precoding matrix, and whereinbased on that a difference between phase values applied to antenna portsfor the transmission of the uplink signal is maintained in some antennaports among all antenna port pairs, the codebook subset includes atleast one specific precoding matrix applying different phase values toantenna ports included in all or some of the some antenna ports.
 17. Amethod for receiving an uplink signal based on a codebook by a basestation in a wireless communication system, the method comprising:transmitting, to a UE, downlink control information (DCI) fordetermining a precoding matrix applied to transmission of the uplinksignal; and receiving, from the UE, the uplink signal based on theprecoding matrix determined based on the DCI, wherein based on that adifference between phase values applied to antenna ports for thetransmission of the uplink signal is maintained in some antenna portsamong all antenna port pairs in the UE, the codebook subset includes atleast one specific precoding matrix applying different phase values toantenna ports included in all or some of the some antenna ports.
 18. Abase station receiving an uplink signal based on a codebook in awireless communication system, the base station comprising: atransmitter for transmitting a radio signal; a receiver for receivingthe radio signal; and a processor functionally connected to thetransmitter and the receiver, wherein the processor controls thetransmitter to transmit, from the UE, downlink control information (DCI)for determining a precoding matrix applied to transmission of the uplinksignal, and controls the receiver to receive, from the UE, the uplinksignal based on the precoding matrix determined based on the DCI, andwherein based on that a difference between phase values applied toantenna ports for the transmission of the uplink signal is maintained insome antenna ports among all antenna port pairs in the UE, the codebooksubset includes at least one specific precoding matrix applyingdifferent phase values to antenna ports included in all or some of thesome antenna ports.
 19. (canceled)
 20. (canceled)